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Astronomy

~71000 answered questions
Parent Category: Science
The scientific study of celestial bodies. Find questions on Constellations, Planets and more.
Short answer: maybe 200,000 miles, give or take. Long answer: Durability will depend on things besides maintenance, such as how often the car is driven and how aggressively it is driven, and where it is driven. 100,000 miles in a year is much harder on a car than 100,000 miles in eight years. Cars…
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Telescope and Radition Collection from Stars Please refer to the link below. This will take you to a web site that discusses this. Multiwavelength astronomy is dedicated to observing the various spectrums of radiation emitted. That is called its light gathering ability. The 'aperture size' deter…
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This is a question about your values. Don't feel that you need to lie and say work is most important to you. If it is not -- and generally it is not -- be honest.Any job searcher needs to do serious introspection. Carefully consider what is important to you and why. Try writing it out. Ask yourself …
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A "waxing gibbous . The Italians would like to be able to see where they are going, & whom they are sooting at. As invaders have learned the hard way for centuries, to invade this mountainous region one must take advantage of everything available to them. - Richard V. Horrell WW 2 Connections …
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There is no clockwise or counterclockwise in space, as clockwise and counterclockwise are based on your point of perspective. Imagine a clock having a transparent face; if you look at it from behind its hands will appear to run counter-clockwise! As far as oddballs, Venus is the only retrograde pla…
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[Note: This is an astronomer's answer. There are numerous answers in series here, so if this one is too long, technical, or you just don't like it, see the numerous other answers beneath it!] It depends on what you mean: 1) just farther than we can currently see in our observable universe or 2) out…
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Explosions in Space All chemical explosives that work on Earth will work in space. Here's why. Chemical explosives are just things that burn, but burn very fast. In fact, they have to burn so fast that they cannot rely on the air to get their supply of oxygen. This means that they have to supply…
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Answer Validity of anything is determined by the results and consequences of that particular thing to most people. If you have a positive experience with something, then you tend to treat it as valid, and the opposite is true if you have a negative experience. Astrology, according to those who p…
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Answer The question asks why does the full moon appear red sometimes. The moon appears red when it is near the horizon. This answer addresses that aspect of moon reddening. Rayleigh Scattering The moon appears red sometimes for the same reason the sky appears blue. It is due to a phenomenon cal…
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It wasn't until telescopes that people realized that the band of light reaching across the sky, called the Milky Way since ancient times, was actually made of an immense number of stars. Astronomers still did not really understand what they were seeing until the 20th century, however. Until the 192…
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Islamic answer: Per Islam teachings and per the God holy book of Quran, Allah (or God and same God worshiped in Christianity and Judaism) is the first before any first we know or we don't know and the last after any last we know or we don't know. َQuran says (meaning English translation) (57:3): …
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Existence of Space Without "space" we would have no place to "exist". It can also depend on how you look at it and what you believe in, as many people believe that space, the planets and the whole universe were created by the "Big Bang" while others say that the universe and space were made by God i…
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Answer All forms of science are about asking questions about the world and trying to find answers. If someone is curious about the size of the universe, science will try to find an answer. Answer If man knew the size of the universe, he 1) would be able to estimate the magnitude of the energy…
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This can greatly vary, because the moon is sometimes closer and sometimes farther from Earth. The average distance the moon is away from Earth is around 230,100 miles, or 370,300 km.
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According to Scientific American: "The North Star, or Polaris, is the brightest star in the constellation Ursa Minor, the little bear (also known as the Little Dipper)."Click on the link to the right for their full article (with a picture showing the location).  Another way to find Polaris is …
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Answer One way to find Polaris, the North Star, is to look for the "Big Dipper" and then look at the two stars forming the edge of the "bowl" on the dipper opposite the handle (these are Merak and Dubhe). Look straight along the line formed by the two stars "up" from the dipper about twice the dis…
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The universe is so, extremely giant, it's pretty much impossible to actually imagine how big it really is. The best thing to do is to start with something small and work up from there; so let's start with the Earth. Earth may seem a giant place to us humans, but no where near in size to the universe…
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Answer Rainfall is not affected by the phases of the moon. Rainfall is affected by local weather conditions such as lows and wind directions, and seasonal variations, such as the "wet and dry seasons of the year". The moon does affect the tides of the oceans, and their rise and fall can be predic…
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Answer (1) There are many theories, and as you can imagine, they are not easily tested. The above answer is generally the inevitable conclusion. But some of the theories are quite fun. Think for a minute about the surface of a globe, like the earth. If you had a super powerful UFO taxi, you could s…
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It's not the moon's gravity alone, but the interaction of the earth and moon. One influence is the fact that the earth-moon system orbits around the common center of gravity of earth-moon. This point is called the barycenter, and it is within the body of the earth since earth's mass is considerably …
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Answer Astronomy is not linked with witchcraft. Astonomy is not the same thing as astrology. Astronomy is the science of studying the universe outside our own planet, including stars, other planets, nebulae, black holes and many other phenomena. It is not prohibited by any religion. Astrology, on th…
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As with a hurricane on Earth the "Great Red Spot" is fed by heat, but unlike on Earth, the heat is generated internally on Jupiter. Since there is no land mass for the storms to pass over on Jupiter, the storms continue to churn away, fed heat continuously. It is unknown how long the Red Spot has pe…
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Calculating Earth's Rotation The Earth makes one rotation in 24 hours (well, not EXACTLY but close enough for argument). So take the circumference in miles (you can look this up) and divide by 24, that's how many miles per hour the surface travels [at the equator]. There are two [ways to measur…
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Approximately half. Because the Moon is orbiting the Earth, various fractions of this illuminated surface are visible, depending on the angle from which we see it. (During a lunar eclipse, some or all of the sunlight is blocked by the Earth. Also, since the sun is larger than the moon, very slightly…
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Worst tv program ever. See Related Links for web site David Pearce (Keith Barron) has been made redundant. He spends some of his redundancy money on a holiday in Spain for himself and his wife Amy (Gwen Taylor). They meet up with another couple, Robert Cochran (Neil Stacy) and his wife Lind…
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The Hale-Bopp comet is now beyond the orbit of Uranus but is expected to still be visible by large telescopes until about 2020. After then, it is not expected to make a return until the year 4534.
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Answer:Most Creationists have no problem with the speed of light. Only the "young Earth" or "young universe" branch have to deal with the issues of light sources "billions of light-years" away. Some have rather interesting ideas about how to reconcile the two ideas, ranging from "God started the uni…
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Nobody "discovered" that the Sun was at the centre of the Solar system. Aristarchus of Samos, a greek philosopher and astronomer (310BC-230BC) first presented the theory that the Sun was at the centre of the solar system (heliocentrism) but his ideas were rejected in favour of the theories of Ptole…
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"The middle of nothing" actually doesn't make any sense. By saying "middle" you are implying spatial dimensions. Space is something, and nothing is literally nonexistence. So you can't say the Universe is in the middle of "nothing." The Universe isn't in the middle of anything, it is everything. &n…
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Not since the Big Bang. Your question seems to suggest that you accept the idea of a Big Bang, since you use the term 'Big Bang' as a reference to time. The concept of infinity also is used in reference to time. unending time. Time as we perceive it began at the instant of the Big Bang. Along wit…
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The gravitational force is a very weak one. Actually we only feel earth's gravitational field because the earth's mass is huge. So is the gravitational field of stars and astronomical bodies. But since the objects we usually deal with have really small masses, it's gravitational force is so weak tha…
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Certainly, if they are small. Unless they enter or skim the atmosphere, they would be next to impossible to detect.
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The sun doesn't actually move. Rather, the earth's rotation (at approximately 24 hours per revolution) makes the sun appear to "rise" and "set" as your position on the earth turns in relation to the sun.when one part of the Earth is facing towards the sun it would eventually become dark. this is bec…
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The age of an individual star can vary; they were all made at different times and have different life spans. Stars can range from a few million to a several billion years old. The oldest star yet discovered, HE 1523-0901, is an estimated 13.2 billion years old.
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The temperature in space is close to "absolute zero" because any object there will radiate heat until it cools to that point. This is for objects not exposed to direct sunlight. In Earth orbit, the temperature of objects in sunlight can rise to 120°C/ 250°F. The actual temperature in space is abou…
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Answer Engine temperature is controlled by the thermostat. An engine can often run hotter if the thermostat has started to fail or if the radiator is partially blocked. The computer is not involved in temperature control. Answer Have the rad and cooling system flushed and change the thermosta…
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Using the Hubble Space Telescope we have seen 13 billion light years into space, these are some of the very first galaxies to form after the big bang. [Search for "hubble space telescope ultra deep field images" to see the actual images.] Although technology is always improving, we can never see mu…
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The circular orbital velocity of a satellite in low earth orbit is about 7 km/s (7.9 to be exact) or 25000 km/hr or 17500 miles/hr. If it reaches sqrt(2) times the circular velocity, it will escape from earth orbit and go into orbit about the sun.The current record holder for a man made object is th…
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Answer The diameter of the moon is about 2,161 miles or (3,476 kilometers). This makes the circumference about 6,790 miles. As you see the moon is small when its circumference is only 6,790 when the earth which has a circumference of 24,859 miles .
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At its center, the sun has a density of over 100 times that of water, a temperature of 10 to 20 million degrees Celsius, and a pressure of over 1 billion atmospheres. By contrast, the surface of the Sun is close to 5,785 kelvins (1/2350th of the core). Thompson, M. J. (2004), Solar interior: Helio…
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The universe does not expand into anywhere, it is expanding everywhere at every moment. The Newtonian view assumes instant communication of the gravitational field. In such a case, one could pose that the kinetic energy of all the matter in the universe speeding off in all directions is equally bal…
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It is space itself that is expanding.However, what is the space expanding into nobody knows, we can only make guesses.
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Four Seasons, Winter. Seasons are a subdivision of a year. The Earth's rotation axis is tilted by 23.4392794383 degrees with respect to the, at different times of a variation in the 180 - 270 deg (mn), longitudes 270 - 360 deg (Winter). The Sun true longitude (Lsun) is derived from Sun mean longitud…
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Answer Yes. His system could not have accounted for the phases of the moon, lunar and solar eclipses and the retrograde motion of the planets. It also would have had trouble explaining why Mercury and Venus always appear near the sun instead of moving away from it as other planets do. Also Tycho …
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Currently, there are signs of wind on Pluto, but no evidence yet, until the NASA spacecraft arrives there in 2015. To have "wind" on the surface of any planet requires the presence of an atmosphere. If an atmosphere exists, then there will be areas of higher and lower pressure and therefore a press…
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Answer yes it does!!! Answer Actually the rotational axis of the earth is inclined 23.15' from the vertical to the ecliptic. It is this inclination that produces the seasons on earth so the deviation is not trivial.
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My favorite Stellarium is awesome! I wish I could install it on everybody's computer: Astronomy Software Downloads The best site to download free astronomy software is: Shatters. Celestia is THE BEST universe navigation program I have ever seen. It is like Google Earth,…
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Answer The Earth's Magnetic North Pole, where the magnetic field lines become oriented vertically, moves constantly due to the drift in the Earth's magnetic field. In 2005, the Magnetic North Pole was located at 82.7°N by 114.4°W. To find the magnitudal 2-D land displacement (distance) from the…
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One way to find Polaris, the North Star, is to look for the "Big Dipper" and then look at the two stars forming the edge of the "bowl" on the dipper opposite the handle (these are Merak and Dubhe). Look straight along the line formed by the two stars "up" from the dipper about twice the distance tha…
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Northern LightsThere is no difinitive brightness to the aurora. The total brightness is in many millions of watts in terms of light produced but in local terms the brightness depends on the following factors:1, The 11 year solar cycle varies the volume of charged particles emitted by the sun. In oth…
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It depends how good you are at looking for them. If you look up into the night sky from a city, with air pollution and light pollution, maybe a few dozen. If you go into the countryside and wait about 20 minutes for your eyes to get accustomed to the dark (with no streetlights of course), significan…
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Sunrise, sunset change due to eccentricity A lot of this is just due to rounding. Most sunrise/sunset tables are in whole minutes, so the changes are pretty choppy. But there is an astronomical reason. If the earth's orbit were a perfect circle, we would see the same change in sunrise and sunset…
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Hottest Layer of the Suns Atmospere. The core is the hottest layer of the sun. Its temperature is nearly 15 million degrees F.The reason that the core is the hottest is due to the gravitational pressure. This being said, there are individual spots in the corona of the sun which from time to time is…
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A white hole is a mathematical construct. It is not something "real" like a black hole, which could be said to be the "generator" or "origin" of the white hole. The white hole arises as a result of the mathematics that describe what is happening inside a black hole.Because of the immense gravity inv…
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Solar ProminencesHigh energy occurrences on or near the surface of the sun that are associated with its changing magnetic field. Typically, they are explosions caused by the very rapid release of energy stored in the magnetic field (although the exact mechanism is not known). These prominences usual…
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Ummmm..............Me thinks the "BigBang" has already been changed to the "Big Expansion". Where the Universe is Infinite, has always been and will always be........just fluctuating as the "Branes" in the 11th dimension fluctuate.See these links: www.pbs.org/wgbh/nova/elegant/program.html http://ww…
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A sextant is an instrument used to measure the angle between two visible objects. It is primarily used as a navigational instrument to determine the elevation of a celestial body above the horizon thereby allowing the observer to calculate a line of position (LOP) on the surface of the earth. With o…
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Answer Astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using physical laws. Today, that distinction has mostly disappeared. Professional astronomers are highly t…
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It depends on how you define "day". A "solar day" is roughly from sunrise to the following sunrise, or more exactly noon to noon. A "sidereal day" is one complete rotation of a planet relative to the background stars. The orbit of the planet around the Sun affects how the sidereal day is related to …
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Use of Area 51 Area 51 (formally known as Air Force Flight Test Center, Detachment 3 and also known as Dreamland, Watertown Strip, Paradise Ranch, The Farm, The Box, Groom Lake, and The Directorate for Development Plans Area) is a remote tract of land in southern Nevada, owned by the federal gove…
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Clouds and the atmosphere.
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Subsolar PointBy definition, the subsolar point is the point on the Earth's surface at which the Sun is at its highest (or lowest) latitude at local solar noon. The Subsolar point changes continually as the Earth rotates and seasonally moving from 23.5 degrees South to 23.5 degrees North (the solsti…
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The Earth is rotating on its axis as a single body, spinning in a vacuum. The atmosphere is pulled along with the rotation, so there are not any things moving at different speeds to make any kind of noise. However, the fact that the Earth rotates is a major factor in the creation of weather, and the…
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It takes about 1,000,000 [1] years, on average. for a photon to travel from the Suns core to the surface. Neutrons make the same passage in seconds. This is because the density is so great at those depths, that there is always something in the way to prevent the photon from getting to the surface. …
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Big Bang The Big Bang theory is an effort to explain what happened at the very beginning of our universe. Discoveries in astronomy and physics have shown beyond a reasonable doubt that our universe did in fact have a beginning. Prior to that moment there was nothing; during and after that moment t…
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No, it does not. For a planet to have liquid water, it must be the perfect distance from the sun, not so close that it boils away, and not so far that it freezes.There is no liquid water on Mars, it is generally far too cold and the atmospheric pressure is too low. While there are certain places (ne…
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Venus has a very strong greenhouse effect. A greenhouse effect is when the gases in the atmosphere trap more of the Sun's heat. A lot of carbon dioxide, a very dense atmosphere, and a thick blanket of clouds help trap the sun's heat. The transfer of heat by atmospheric currents means both the night …
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Europa Europa is one of the first four moons discovered circling Jupiter. Check out this webiste for more information: http://www.solarviews.com/eng/europa.htm
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Mercury's Features The Caloris Basin. The diameter of it is approximately 1300km.
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Benefits of Astronomy Many developments in optics come from astronomy. The Galilean refracting telescope and the Newtonian reflecting telescope form the basis of pretty much every optical system in the world, including disposable cameras, photocopy machines, TV cameras and more things than I can …
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Solar PointI don't know. I know what the subsolar point is, it's the point in a orbit (of an object around a planet) where the sun is as close to overhead as it can get. Am I close?if this is true then the solar point would most likely be noon on earth. or at scale (since he said a satelite to the s…
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Sir Edmond Halley - of the comet fame - was a British scientist who made a number inventions, one of which was the metal coil thermometer. It is still in use today in refrigerators, freezers, and ovens. See related link for more information.
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Its under the intake manifold. Buy a repair manual and have at it. If your-re a decent wrench and have plenty of tools you can do it. Dealer wants about $1200 to do it. Starter costs about $250
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Of these four choices, out current understanding of Europa (and remember, everything is subject to change in the light of more recent discoveries) indicates that Europa may have large liquid oceans under a layer of ice. There are interesting surface features that appear to be large ridges; these mig…
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The world - as in the Earth will last for billions of years. Life on the Earth is a matter of some speculation - from an astronomical point of view, life will have to change and evolve in about one billion years time, when the Sun starts to get larger and warmer. From an environmental point of view …
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The Milky Way Galaxy is the second largest galaxy, after Andromeda, in the Local Group. The Triangulum Galaxy (a.k.a., the Star Wars galaxy) is the third largest. The Local Group contains about 30 galaxies, including dwarf galaxies.
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Average and Closest Distances Pluto is an average of 5,913,520,000 km (39.5AU) from the Sun. Earth is an average of 149,600,000 km (1.0AU) from the sun. This would indicate a distance of over 5.7 billion kilometers or 38.5 AU between the two. However, Pluto's orbit is highly elliptical and varies fr…
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Life Without Night You'd probably be living in Alaska during the summer. Nightfall You should read the story Nightfall, by Isaac Asimov.
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Saturn's Yellow Bands All of Saturn's rings are primarially made of water ice. The colors come from trace elements, which vary in composition depending on how far from the planet the ring is.
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Rome Italy venasaala and so much more
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if my math is right Pluto is 2,907,000,000 miles . But it is not always that far because Pluto's orbit is in a oval shape.
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We can't yet be certain, but the current best guess is that it is predominantly covered with ice. In fact, one of the interesting theories concerning Europa is that the ridges that we can see on the surface were caused by the ice cracking, and the liquid (water?) beneath boiling into space and then …
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They think that there is the possibility of liquid water layer under the 100 Km deep ice sheet. They think that this is possible when tidal force caused by jupiter's gravitation heatens the core of the moon, and that energy liquidifies the water at a certain degree. Also they think that heat, liquid…
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Light Produced by the Moon - NONE!It only reflects light from the sun. Moon actually cannot produced its own light, in fact as what above stated it only reflects sunlight from the surfaces.
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No, it has changed over time. The original atmosphere of the Earth was mostly carbon dioxide with some water vapour, ammonia and methane, and was probably formed by volcanic outgassing. Living things introduced oxygen, and were one of the causes of reduced carbon dioxide. The ammonia then reacted wi…
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Satellites Visible in the Night SkyAbsolutely! Especially late dusk when their solar panels catch the sun and shine it your way. The International Space Station is the third brightest object in the sky, only surpassed by the sun and the moon. If you are using Ubuntu go download GNOME Predict, of sim…
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Scientists think that Europa ,one of the satellites of Jupiter must have life in it as it is believed that the satellite is purely covered by thick sheet of ice, which is the solid state of water .it is also believed that the satellite also answers the Urey- Miller Hypothesis
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Beyond the UniverseThat's the question that mankind has been trying to resolve for centuries and that's why they go to the moon and are trying to discover what is on other planets. They call space "the last frontier", but that's simply not true. The ocean has vast secrets to give up yet. There are m…
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Next 500 YearsWe can't predict the future. Would anyone in 1747 predict the atomic bomb? No.This question is impossible to answer, both in according with physics and common sense.  Alternative answerDeterminism will be disproved.i thought the world was coming to and end. So its the reason i ke…
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The critical part of a liquid-fueld rocket that provides it with its ability to "fly" is the combustion chamber, sometimes, but not always, including a shaped nozzle, positioned at the rear (bottom) end of the vehicle. The combustion chamber is open at one end. In its simplest form the chamber is bo…
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Reason for Two Tides Tides are caused not simply by gravity but by the gravity gradient or in other words the difference in gravity in different places. The side of the earth that is closer to the moon is more strongly accelerated than the side that's far away. The water that's near the moon gets pu…
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Why Stars Glow Stars glow for the same reason that the sun glows. They are gigantic balls of flaming gases. The reason the stars look so small, is the incredible distance between earth and the stars. (The light that we see from the stars can be millions of years old because it took that long for …
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Why the Moon Revolves Around the Sun Technically, it doesn't. The moon revolves around the earth, kept in orbit by the earth's gravitational pull. Because the earth revolves around the sun, the moon incidentally makes the same trip. Answer I remember reading somewhere an analysis to the effec…
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Milky Way The Milky Way is about 100,000 light years in diameter (one light year is about 9.5 x 1015 meters), but only about 1000 light years thick while M10 is a globular cluster of about 100 stars, all quite similar in size, M12 is an open cluster of bright and fainter stars, more loosely packe…
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Elliptical galaxies may vary in shape form but are spherical or flattened disk-shaped galaxies (large groups of stars). See related link for a pictorial.
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An elliptical galaxy is a type of galaxy that has an elliptical shape rather than spiral shape. It has been suggested that this shape is due to a collision between two spiral galaxies.
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The universe is incomprehensively vast. Nonetheless, some day it will cease to exist as we currently perceive it. The sun will use up all its fuel and die in about 5 billion years or so. At that time the solar system will no longer be habitable. Will humans be around at that time? No one knows. The…
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