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Astronomy
The scientific study of celestial bodies. Find questions on Constellations, Planets and more.
23,887 Questions
When you talk about astronomical objects, it is usually more appropriate to talk about their mass, not their weight.
A quasar is powered by a supermassive black hole; those have a mass of millions or billions times the mass of our Sun.
Why are there no comets close to the Sun?
Comets are composed of volatile materials such as ice, dust, and rocky debris. When they come close to the Sun, the heat causes these materials to vaporize and form a glowing coma and tail. This process, known as outgassing, leads to the gradual disintegration of the comet. Therefore, comets tend to stay in the outer regions of the solar system where they can remain intact until they approach the Sun.
Which is biggest sun or moon or star?
The moon is tiny. The earth is about 3 times bigger across than the moon.
The sun is an average sized star. It's about 110 times bigger across than the earth. =
There are many stars smaller than the sun, and many stars bigger than the sun. The sun and all stars are bigger than the moon.
What angle would earth's tilt need to be in order for there to be no seasons on earth?
If the Earth had no axial tilt, the only seasons would be those caused by the difference in the Earth/Sun distance at perihelion and aphelion, which is an extremely minor factor (in fact, the Earth is closest to the Sun during winter in the northern hemisphere currently).
What is the approximate temperature of your sun?
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 about 3°K (-270°C or three degrees Celsius above Absolute Zero). There are still molecules in space, just very few of them, and this is their temperature.
Absolute zero is a theoretical temperature where the thermal kinetic energy of the molecules in a body goes to zero. This cannot be achieved through artificial or natural means, because there is no way to remove the last small amount of thermal energy. The coldest temperature in space is about 3°K above absolute zero. This is defined as the Cosmic Background (or Microwave Background) Radiation that was first detected by Penzias and Wilson using the Holmdel Horn Antenna in New Jersey, USA in 1965. This radiation quite literally is the echo of the Big Bang.
Assuming you're measuring the temperature of pure space, or an area in which there is no matter that could absorb the sun's radiation and thereby heat up, the temperature would be -459° Fahrenheit, -273° Celsius, or 0 on the Kelvin scale.
Cosmic Background RadiationThe temperature is not absolute zero because there is a pervasive background radiation, with an equivalent temperature of 2.7 K. Alternate view:This is an amateur opinion. When measuring, for example, the heat of a distant star, one is not measuring the heat of the intervening space, even though the radiation we are detecting passes through it. It is possible that the same thing can be argued for the background radiation. An analogy might be that if a photon of light reaches earth, it is because that photon was not absorbed by anything during its trip, not even the tiniest particle of matter. Clearly, photons that are absorbed along the way never reach us. It might even be possible in a weird quantum sense that the photon may just be a probability greater than 0 and less than 1 until and unless it is absorbed by something.So it may be that completely empty space has no temperature at all (not even absolute zero), because there is nothing in it to either absorb or be void of heat. Empty space is not capable of absorbing or radiating heat. If a thermometer were placed in absolutely empty intergalactic space, it would probably eventually register the background radiation, but this would be because the thermometer itself has absorbed radiation that would otherwise not have been absorbed and that would have continued to propagate through space.
Here is another way to consider the same question. Say that a perfect or near perfect vacuum could be created here on earth, in a lab at ordinary room temperature. What would you claim to be the temperature of this vacuum, and what information would you use to support your claim? Temperature is a characteristic of matter, and not of vacuum.
Correction to the aboveThe question does not ask the temperature OF space, but rather IN space. Radiation from anything in space will cool it without any need for a conducting medium. The loss of heat will continue until the object reaches very nearly absolute zero. If an object receives sufficient radiation from the Sun, it will heat only the surface exposed to the Sun, and cool from the others. So spacecraft that are designed to reflect the Sun's heat will need another heat source to keep the interior warm. This varies from temp to temp. Usually it is 2-4 degrees kelvin. Sometimes hotter depending on where you are in space. Otherwise it is -400 degrees Fahrenheit. Pretty darn cold if you ask me. Don't go into the cold recesses of space without a space suite.What would happen if there was no such thing as the mesosphere?
Well, isn't that an interesting thought! The mesosphere plays an important role in our atmosphere, helping protect us from meteoroids and allowing for the beautiful phenomenon of noctilucent clouds. Without it, our atmosphere would be quite different, but nature has a way of finding balance, so I'm sure something else would step in to fill the gap. Just like in painting, every element has its place and purpose.
Writing that comes from far away is called a?
Well, isn't that a lovely question! Writing that comes from far away is called a "foreign text." It's like receiving a beautiful message from a far-off land, full of new perspectives and ideas just waiting to be explored. Embrace the uniqueness of these words and let them inspire your own creativity.
What is the meaning of the sky makes night of day statement?
The phrase "the sky makes night of day" is likely a poetic or metaphorical expression. It could be interpreted to mean that the sky, by darkening during the evening, brings an end to the brightness of the day. This could symbolize the transition from day to night, where the sky's changing colors mark the passage of time. Overall, the statement suggests the cyclical nature of day and night as dictated by the sky's appearance.
The Sun is closer to the Earth than the Moon is true or false?
True. The Sun is much closer to Earth than the Moon. The average distance from the Earth to the Sun is about 93 million miles (150 million kilometers), whereas the average distance from the Earth to the Moon is about 238,855 miles (384,400 kilometers).
What is the distance between the earth and the sun in both kilometers and meters?
The Earths orbital distance from the sun is 149,597,890km (149,597,890,000 metres) on average, 147,098,290km (147,098,290,000 metres) at its closest and 152,098,232km (152,098,232,000 metres) at its furthest. The average sun to Earth distance is how one Astronomical Unit is defined (1 AU).
How does a solar eclipse show that light travels in straight?
If light did not travel in a straight line then the light would just bend around the body that is suppose to be making a shadow and no shadow would be observed. as there is a shadow cast by that body this proves that light does not bend and in fact travels in a straight line.
Carries a crew of five to seven and is designed to go only into Earth's orbit?
Oh, dude, you're talking about a space shuttle! It's like this big ol' spaceship that takes a bunch of people into Earth's orbit. It's like a fancy space taxi for astronauts. So yeah, it's got room for a crew of five to seven, and it's all about that Earth orbit life.
What country is 10 degrees North and 70 degrees West?
Oh, dude, that's like the coordinates for Colombia. So, if you ever find yourself feeling a bit lost and you happen to be chilling at 10 degrees North and 70 degrees West, just remember you're in the land of coffee, emeralds, and Shakira.
Is this sentence is inference or observation that the sun rises in the east?
The statement "the sun rises in the east" is an observation based on empirical evidence. Observations are made through direct sensory experience or measurement. In this case, the consistent pattern of the sun's movement from east to west as seen from Earth is observed and recorded over time, leading to the conclusion that the sun rises in the east.
What is the radius of Neptune's Orbit?
The radius of Neptune's orbit is equal to its distance from the Sun, which is: Average distance from the Sun = 30.066 AU = 4.498 x 10^9 km
Maximum distance from the Sun = 30.367 AU = 4.543 x 10^9 km
Minimum distance from the Sun = 29.453 AU = 4.453 x 10^9 km AU = astronomical Unit, 1 AU = Earth-Sun distance = 149,600,000 km or 1.496 x 10^8 km = 92.96 million miles
How many sides and corners does a star have?
A star typically has five points or sides, with each point forming an angle of 36 degrees at the center. Therefore, a star has five corners or vertices where the sides meet. This geometric shape is known as a pentagram.
What do astronomers use to plot positions in the sky?
Positions in the sky are measured by angles. The simplest is the altitude, the angle above the horizon, and the azimuth, the direction measured running eastwards from north. There are other systems but always two coordinates are needed to specify a direction.
Star positions are measured with a transit-circle, which always faces exactly south, and the stars are timed as they cross the meridian. The altitude gives the star's declination in degrees and the time gives the right-ascension in hours and minutes after a standard direction known as the First Point of Aries has passed.
How many stars are bigger than earth?
Assuming you mean visible from Earth with the naked eye, then all of them. The smallest know star - is a little bit larger than Jupiter, and Jupiter is ten times bigger than the Earth.
see http://www.universetoday.com/guide-to-space/stars/what-is-the-smallest-star/
There are 28 days that exist in February except for every fourth year when there is a day added which is of course the February 29th. The reason being that each day is not exactly 24 hours rather there is a little bit of time that each day goes over the 24 hour period. To make up that time a 24 hour period is added to our calendar once every four years.
Baby's that are born on the 29th of February are called leap year baby's.
The year 2012 (and all years divisible by 4 but not 100 but 400) February has 29 days.
What instruments used for studying the universe?
Studying the universe involves a variety of instruments and techniques, each suited to different aspects of cosmic phenomena. Here are some key instruments and methods used:
Telescopes:
Optical Telescopes: Observe visible light. They can be ground-based READ MORE
Radio Telescopes: Detect radio waves emitted by celestial objects. READ MORE
Infrared Telescopes: READ MORE
Ultraviolet Telescopes: WATCH VEDIO
X-ray Telescopes: Detect X-rays from high-energy regions of the universe. The Chandra X-ray Observatory is a key instrument in this category.
Gamma-ray Telescopes: Observe gamma rays, the highest energy form of electromagnetic radiation. The Fermi Gamma-ray Space Telescope is used for this purpose.
Space Probes and Satellites:
Voyager Probes: Launched by NASA, these probes are exploring the outer boundaries of our solar system.
New Horizons: Studied Pluto and is continuing its journey into the Kuiper Belt.
Parker Solar Probe: Aims to study the outer corona of the Sun.
Gravitational Wave Detectors:
LIGO (Laser Interferometer Gravitational-Wave Observatory) and Virgo: Detect ripples in spacetime caused by massive astronomical events like merging black holes.
Neutrino Detectors:
Neutrino Observatory: Located in Antarctica, it detects neutrinos, which are elusive particles that can provide information about cosmic phenomena.READ MORE
Cosmic Microwave Background (CMB) Observatories:
Planck Satellite: Measured the cosmic microwave background radiation, providing insights into the early universe.
Spectrographs:WATCH VEDIO
How long is the orbit of Uranus in days?
For our planet [earth] it takes exactly 365.25 days to completely orbit around the sun and if you do the math the reason we have leap years is because the .25 extra days eventually add up to 1 every 4 years. Just in case you were wondering
Hiw long does it take for a light beam from the sun to hit the earth?
From the time the light photon is generated in the core of the Sun, it may take millions of years to get to the surface. But once it reaches the surface of the Sun, the Earth is only 8 minutes 20 seconds away!
Are all neutron stars pulsars?
No, not all neutron stars are pulsars. Pulsars are a type of neutron star that emits beams of radiation, which can be detected as pulses of light. Some neutron stars do not emit these beams and are not classified as pulsars.
Are all stars in other galaxies suns?
No, not all stars in other galaxies are suns. While some stars in other galaxies may be similar to our Sun, there are also many different types of stars with varying sizes, temperatures, and characteristics.
