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Astrophysics

~4500 answered questions
Parent Category: Cosmology
Astrophysics is the scientific discipline concerned with the events that are taking place on the grandest of stages; the universe. Questions about the formation and evolution of the planets, solar systems, stars, and galaxies found within the universe, as well as questions regarding black holes, cosmic rays, particle and nuclear astrophysics, nucleosynthesis, and magnetohydrodynamics should be directed here.
Food is getting into the hole and causing infection. It's wise to see your dentist. Although it sounds gross (it's actually relieving) the dentist can reopen the gum and pack it with antibiotics and should feel much better. I had this happen when I had my 4 wisdom teeth taken out. It hurt like crazy…
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dry it off try J-B weld epoxy, on it can be purchased at a hardware store
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0. Wait for fall. 1. Drain pool. 2. weld frame holes with addition of small squares of same/similar material as metal frame. 3. Cover with silicone so it is smooth, will not puncture liner. 4. Patch liner.
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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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Yes, black holes do, indeed, exist in the universe. We've actually "seen" them, but they can be observed only indirectly. No light can escape them and all nearby matter gets trapped in their gravitational field. Particles which are not far enough away to escape but not close enough to be pulled in a…
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American football is a sport where two opposing teams attempt to score points by moving an inflated oval ball past a goal line. The ball can be advanced by carrying the ball or throwing it from one teammate to the other. Points are scored when a member of either team carries the ball across the opp…
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Bandanas The bandanna is affiliated with the gangs and their activity. The colors specify between the groups. Most popularly the red and blue. Some say that the bandanas distiguish between the races, and others say for where you live. What's also confusing is where they can be worn. Since in most…
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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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Measuring Galaxies and Black Holes If you know how far away it is, and the angle that it subtends, you can tell its size. For example, if something is 100 meters away and it fills 10 milliradians, it's 100 * 0.01 = 1 meter across. (A milliradian is 1/1000 of a radian, and a radian is about 57 degree…
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Projection of Light Black holes do NOT project light. Hence the name black hole. Their gravity field is so strong that nothing escapes, not even light photons. The only way we know they exist by the bending of the trajectory of photons passing them. Galaxies project light via radiant energy, i.e…
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Global Positioning System: The mankind depends on the sea trade for transportation of food grains, fossil fuels, metal ores, etc. Global navigation system, GPS helps in timely delivery of these essential goods by providing the ships with essential navigation information. The GNS services are made av…
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Disclaimer: Further content is theoretical, as wormholes themselves are theoretical. To understand wormholes first you must understand that although we live in a 3-dimensional universe (actually it's 4-dimensional but thats a story for another time), and that it doesn't stop at 3-dimensions. There …
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The event horizon is a "point of no return"; anything within the event horizon can't get out, even at the speed of light. An event horizon is the "surface" of a black hole. It is the line that is crossed right where the chaos stops and the actual hole begins. it is theorized that beyond this hor…
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After the Big Bang, just three things resulted in the formation of this vast universe... protons, neutrons and electrons... I completely agree with the answer and that's purely true!
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John Michell assumed that an object that was compact enough would not be able to emit light; his calculations were based on the escape velocity. At his time (18th. century) the idea was considered preposterous. Soon after the publication of the General Theory of Relativity, Schwarzschild (by coin…
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A supermassive black hole is a an extremely large black hole, in the order of possibly billions of solar masses. They are thought to have formed from stellar black holes that managed to absorb enough mass from other objects, even other black holes and that they, without outside forces, can go on for…
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From Supermassive stars. It is quite probable that supermassive black holes formed from the earliest population III stars.
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One would think that if a hole is drilled, eventually we will reach the other side of the earth. But actually doesnot happen. The earth's crust is supposed to be made of molten iron at a very high temperature and also the acceleration due to gravity, g, is zero at the centre of the earth.So, most p…
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Neptune is pretty comparable to Uranus, with Uranus being slightly larger, and Neptune slightly heavier. Neptune's radius at the equator is is about 3.88 Earths, while Uranus is about 4.0 Earths for the same measurement.
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No known life on Mercury, but given there are now confirmed billions of tonnes of water ice locked up in the poles. The planet itself is subjected to tidal forces of the Sun. Put the two together and there are real possibilities that underneath the ice there may be small areas of liquid water around…
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The Sun is about 4.57 billion years old, so is the solar system.The age of the Solar System is determined through the radiometric dating of heavy elements such as uranium. Measurement of radioactive decay rates allow us to determine when the elements in the Solar System were formed. The most curren…
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Over 400 planets have been discovered so far around other stars.
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Scientist George Cresswell No the universe does not end its just hard for humans under stand because where a small planet in a big universe.Thanks alot.Answer (2) What I always thought of was the word nothing, nothing is something by being itsself which is nothing...but that's something still so im…
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Black holes can be found anywhere a massive star existed. Most, if not all, galaxies have a supermassive black hole at their centre, and there are a number of stellar black holes throughout the galaxy. V4641 Sgr is believed to be the closest known black hole to Earth at 1,600 light years away.
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Pluto was declared a dwarf planet in 2006.
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How Black Holes work. The intense gravitation of a black hole is strong enough to bend the space and time in it's vicinity. This intense gravitation causes a sort of a funnel effect in that space time which causes objects to be gravitationally attracted to it. It is believed that the atoms of ma…
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What you are seeing is an absence of light. You distinguish a black objects presence by its lack relative to other things.
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there really is no way of knowing for sure at least not with the technology we have now but there are a lot of theories ranging from massive seismic events like earthquakes and volcanic eruptions all the way to releasing demons from hell.
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They don't "lead" anywhere. Any mass that falls into the black hole stays in the black hole. There is a theory that, in the case of rotating black holes, matter may emerge elsewhere from a "white hole".It's an idea that remains controversial and highly speculative.
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The universe is probably finite and unbounded. A sphere's surface is finite and unbounded. You can travel along the surface of the earth without ever hitting a boundary. The universe is like that, only in a multi-dimensional sense. It is not something that can be easily pictured or imagined. No, A…
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Black holes are formed when a really big star dies out. When that happens, the outward force of the star's nuclear fusion cannot overcome its gravity, so it collapses. If the star has more than about four times the mass of our sun, nothing can stop the star's collapse, so it becomes smaller and dens…
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Simple. Take a look between your legs.
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It's a spectroscopic effect. We can easily measure the energy of light given it's frequency. E=hv.Radiation like light can excite (electronically or vibrationally) air molecules and various other molecules in the car. Excited states of molecules are extremely short lived, thus the molecules will rap…
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This is a question that is difficult to answer because there is so much we still don't know. However, based on what we do know, there is no cause for concern. Most scientists doubt that the universe will end at any time soon. There is no evidence of any catastrophic event that might cause such a thi…
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The most massive black holes currently known (as of 2014) have a mass of about 20 billion solar masses. Those are supermassive black holes in the cores of large galaxies.
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First you must learn what the Schwarzschild radius is. The Schwarzschild radius is the radius of an object if all the mass of the object was condensed so that there are no gaps. The Schwarzschild radius of an object is almost always gargantuously smaller than the radius. The earth has a Schwarzschi…
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Arcturus, one of the brightest stars seen from earth, is sometimes called The Golden Star. Its name comes from Ancient Greek ????????? (Arktouros) and means "Guardian of the Bear," referring to its position next to the Greater (Ursa Major) and Lesser (Ursa Minor) Bears constellations.
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The opposite of matter. an anti-matter atom has positrons (inverse of electron), anti-protons, and anti-neutrons. Antimatter Antimatter is quite the opposite of 'normal' matter. It is made up of postirons that orbit around the nucleus in shells and have a positive charge. Antiproton (a proton with…
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According to current understanding, there is not really any definite moment at which it will end. It will simply expand faster and faster, available energy will decrease over time (Second Law of Thermodynamics!), and the reduction in available energy will make it harder and harder for any type of li…
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Not necessarily. In the case of supercooled helium-4, the probability amplitude is positive for the atoms to get on top of each other since they are Bose particles. Bose-Einstien condensation is the name for this process of Bose particles going into the same state, and then when enough particles ge…
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Space is not black, space is transparent.
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If matter falls into a black hole, it will be accelerated so much that it will emit x-rays. These are emitted before the matter reaches the event horizon, that is, before it is "inside" the black hole. Any x-rays emitted after the matter passes the event horizon will stay inside.
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Yes, there is a difference between a black hole and a dark hole. The black hole is that "monster of the universe" that is the remnants of a collapsed massive star. It is a place of extreme gravity, and gravity is so great that nothing, not even light, can escape. And because not even light can escap…
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No lifeform can be sustained without water
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Black holes are the result of the gravitational collapse of a massive star.
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The Universe, as unimaginably vast as it is, will eventually cease to exist, at least as we currently know it. Whether it will truly "end" and exactly what will happen to it, scientists still aren't sure. The Universe's fate will come billions, maybe even trillions of years from now, and the human r…
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As of (2011) no planets have been observed that are habitable. Some MIGHT be, but until detailed research is done on the actual conditions, it cannot be said a planet is habitable.
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They don't because what we call a falling star isn't a star at all. Actual stars are enormous balls of extremely hot gas and plasma. The Sun is a star. All the others are incredibly far away and would never come near the Earth. Most would swallow the planets if they could. A shooting or falling star…
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All trucks in Canada are now required to be governed. I believe they must be governed at 100 km/h (62 miles per hour), but I could be wrong about that. However, the speed limit in Canada is 100 km/h.
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check the link under 'edit links' in the left column for details.It is 10-16 m.
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From what I've heard and read about the black hole, I don't believe anyone can enter a black hole and live. From what I've read, it sounds like you would be compressed. It would be like being crushed slowly without being touched. I'm just wondering if we can travel underneath it. If so, then we woul…
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A powerful torch lit inside a tornado might be visible to someone observing it from a safe distance, but dust and debris would likely absorb most if not all of its light. However a torch dropped into a black hole would completely disappear from view, not only because it would be completely and ut…
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The Earth and all the planets are formed 4.5 billion years ago with interstellar hydrogen gas and heavier elements previously formed in earlier stars that had exploded. The Sun, a young star, consists almost entirely of hydrogen and helium, which are being converted into other elements by a proces…
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When photons pass by a black hole, nothing happens, except gravitational lensing, wherein the photon is taking a shorter path due to the mass of the singularity more or less "stretching" space. Photons have no mass, so they are not affected by gravity at all. However, that is not necessarily true, I…
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Like virtually all of the naturally occuring elements, gold originated in the explosions of stars.
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You would lose the water/antifreeze mix in the system of course. If you think the hose or hose's are bad replace them.
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The philosopher and geologist John Michell in the late 18th century described what would happen to infalling matter approaching a body of a certain mass where it had sufficient acceleration from gravity to approach the speed of light, and proposing the idea that light theoretically emitted by it wou…
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basically whenever the sun dies, but that will not happen for a few million years
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A Parsec is equal to the following:Miles : 19 TrillionKilometres : 31 TrillionAtronomical Units : 206 ThousandLight Years : 3.261 Parsec = 3.26163626 light years
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You can't see a black hole directly, because light can't escape. However, you can see the effects of the black hole, like the things that are getting sucked into it.
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Then their even horizons touch. Whether or not they pull each other together will depend on the physics of their closure. Because black holes have such massive gravitation, they'd have to be moving pretty quickly "across" each other's path to avoid a situation where they were mutually trapped in eno…
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Black holes were described theoretically before evidence for their existence was collected from astronomical observations. The philosopher and geologist John Michell in the late 18th century described what would happen to infalling matter approaching a body of a certain mass where it had sufficient …
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The benefits of space exploration is it helps man think outside the box as far as the dwindling resources are concerned. The risk is that it can lead to death.
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The mass of everything that collapsed into a black hole, or fell into a black hole. This mass is concentrated into a very small space.
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The following quote should about cover it: om prakash also discover how the world ends. He found out that due to the smoke the rises from the factories and industries, the smoke was so harmful that it will remove the ozone layer that protects the direct rays of the sun. when these happens the eart…
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Only two of the planets (if we exclude Pluto) have official discoverers because the others have always been visible to the unaided eye. The two that were discovered are Uranus (in 1781) and Neptune (in 1846). Former planet Pluto was discovered in 1930.
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I think that is one of the charges you can get in California if you drive over 100mph, either that or reckless endangerment.
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In the Universe the largest object structurably is Sloan Great Wall which is1,370,000,000 light years wide and the biggest physical object is the Observable Universe Which is 93,000,000,000 lights years in diameter
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The tallest girl who ever lived was Amanda Doffy 1981-2006
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Newton's Law on Universal Gravitation applies to "Black Holes" in that "Black Holes" are the condition where matter is traveling at the speed of light. This is an equilibrium condition where the gravitational attraction is balanced by the centrifugal force. This gives GM/r= c2 , where r is the radiu…
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Scientist believe that a black hole might/can bring us into a different universe...it has still remained a theory for a black hole stretches anything that enters it...not even light can escape...to know more about it go to youtube and search the channel vsauce.. they answer the biggest mysteries in …
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Yes, gravity causes an attraction between two black holes. When two blackholes approach close enough for their event horizons to touch they simply merge into one larger blackhole. Neither one is inside the other.
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Currently, yes, Dark Hole is banned in Advanced Format.
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Karl Schwarzschild theorized it but John Wheeler expanded on the idea and coined the term 'black holes'.
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There are many important natural resources. These can be describe in very general terms, such as  Water, Soil, Forest, Land, Ocean etc. In specific terms there are thousands more.The word "important" denotes valuable according to some person's viewpoint and to get a specific answer, a specific …
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The gravitational force that a black hole has on another object depends on the following: 1. The mass of the black hole 2. The mass of the object 3. The distance between the centres of the black hole and the object (r) Using Newton's Law of Universal Gravitation, this force can be calculated using …
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No. Nothing could survive in a black hole.
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First the star triples in size, then turns red and becomes a red giant. If the sun did this, sunrise on earth would look like this: http://upload.wikimedia.org/wikipedia/commons/archive/b/b2/20070304094558!Sun_Red_Giant.jpg (Copy and Paste or click it if it ends up as a hyperlink) Then the sun will …
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Answer It will just get sucked in and pulled to another part of the Universe. It will supposedly take you to another place of the universe in FAST time.You would explode from the lack of atmosphere, then your remains would be crushed into a microscopic size. the super gravitational pressures w…
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tape that doesn't tell lies
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The names of the planets in our solar system are: Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto used to be regarded as a planet, but is now classified as a dwarf planet.
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Physicists
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This is typically called the accretion disk. This material is so hot it glows with x-rays and is the source of all light that leaves the vicinity of the black hole.
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A supermassive black hole is a black hole with a very large mass, millions to billions times the mass of the sun. The supermassive black hole in our galaxy is about 4 million times the mass of the sun.
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Planet x is located as Pluto but Pluto has gotten demoted.
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An Astrophysicist is one who studies the universe and the planets.
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is when your bright
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Most likely on the other side of a black hole is nothing,It is probably like a blender and would destroy you as you entered.chris: the concept of the movie black hole where its a wall that you could walk through and be in a different universe or time isn't true. it comes from a collapsed star so it …
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Stars more massive than the sun turn into a red supergiant rather than a red giant.At its core, the red supergiant burns helium to make other elements including carbon and oxygen. Eventually it begins to make iron.Iron absorbs energy rather than releasing it.In a split secopnd, the star collapses un…
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Current estimates from NASA suggest that our galaxy alone contains anywhere from 10 million to 1 billion black holes.
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The consideration for whether our universe is truely everything depends on one's determination of what the universe means to them. It could be said that the universe is endless because its very determination is built upon the evolving consideration of a reality within the dimensional degrees of S…
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Black holes are created when a star runs out of fuel and collapses.That is a nova, A black hole is made when a neutron star goes SuperNova and the energy tears a hole in space, creating a strong gravitational singularity.
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because there is not enough light to brighten the who outer space :)) your welcome
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Mercury- 4, 879.4 kilometers (3,032 miles)Venus- 12,103.6 kilometers (7.520.8 miles)Earth- 12, 756.1 kilometers (7.926.28 miles)Mars- 6,787 kilometers (4,221.59 miles)Jupiter- 142,984 (88,865 miles)Saturn- 250,900 (155,000 miles) With ringsUranus- 51,118 kilometers (31,763.25 miles) With ringsNeptun…
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To the best of our knowledge, at the end of the life-span of a black hole there might be an explosion marked by a gamma burst. This is consistent with theoretical work proposed by Stephen Hawking which posits that black holes interact thermodynamically with the universe such that they have a finite …
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