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Astronomy

The scientific study of celestial bodies. Find questions on Constellations, Planets and more.

23,887 Questions

Can you predict the movement of the stars?

It's pretty easy. They move west at approximately 15 degrees per hour.

Outside of that (which is a result of Earth's rotation, not an actual movement of the stars), most stars don't move appreciably over a human lifetime.

Why did early explorers study astronomy and geography?

cartography would help by making the maps astronomy would be like the science that does with the moon and stars so they can make calanders and i am not sure about mathematics thats why i am looking it up

When two or more nuclei fuse to form another nucleus the source of the sun's energy?

Nuclear fusion is the source of the Sun's energy. In the Sun's core, hydrogen nuclei fuse to form helium nuclei, releasing vast amounts of energy in the form of photons. This process is sustained by the Sun's enormous gravitational pressure and temperature.

How far from earth is the star cygni?

Friedrich Wilhelm Bessel measured its distance from Earth at about 10.4 light years, very close to the actual value of about 11.4 light years; this was the first distance estimate for any star other than the Sun,[13] and first star to have its stellar parallax measured.

Is it true the cycle of tbe phases takes about two days longer than the moon revolution around earth?

Yes it is true.

Period of the moon's revolution around

the Earth (and rotation on its own axis). . . . 27.32 days

Period of the cycle of the moon's phases . . . 29.53 days

Difference . . . . . 2.21 days (phases longer)

How many sun can fit into Sirius a?

Arcturus is approximately 26 times larger than the Sun. So about 17,500 Suns will fit into it.

See link for pictorial representation

What is the importance of the sun as a source of energy?

The sun, first and foremost, is a star. It is basically a massive sphere of plasma and gasses which burn via fission and fusion. The constant burning of the gasses is what creates energy in the form of light and heat. The sun is about 5 billion years old, and contains enough mass to continue burning for another 5 billion years! It makes up 99% of our solar system, the other 1% are planets, moons, and comets or asteroids. The sun is vastly important in many ways. For one thing, the sun gives our planet the heat it needs to sustain life. Our planet is at just the right distance from the sun so that its neither too hot or too cold. Either of those extremes would mean no life on earth. The suns energy also allows the process of photosynthesis to occur, which in turn, allows for the abundance of plant species on this planet to thrive. Plants and trees, aside from being beautiful, food-providing objects, help our atmosphere by turning poisonous gasses like carbon dioxide into oxygen. The sun, because of how massive it is, helps to deter objects like comets and asteroids from slamming into the earth via its intense gravitational pull. These are a few of the things that makes our sun important. Sadly, the sun that made the earth ideal for life will also one day be the earth's and man's ultimate destruction. For it, like everything else, will die someday. And when it goes, we will too.

How many astronomical units in 4500 million kilometers?

4,500,000,000 kilometers = 30.1 astronomical units.

What must happen before a protostar will glow?

Before a protostar can start glowing, it must finish collecting enough gas and dust to trigger nuclear fusion in its core. This process requires the protostar to reach a temperature and pressure high enough for hydrogen atoms to fuse together, releasing energy as light and heat.

Which one is more precise exsplain between parallax and ray-tracing method?

Ray-tracing is a more precise method than parallax in computer graphics as it simulates the path of individual light rays in a scene to generate highly realistic images with accurate lighting, reflections, and shadows. Parallax, on the other hand, uses the displacement between two viewpoints to create a perception of depth, but it may not capture the intricate details and nuances present in a scene as effectively as ray-tracing.

Do stars very far away from earth influence earth's motion?

No, stars very far away from Earth do not have a significant influence on Earth's motion. The motion of Earth is primarily influenced by the gravitational forces of the Sun and Moon. The gravitational effects of distant stars are negligible compared to these closer celestial bodies.

Where is the largest gap between planets?

No. It is Mars and Jupiter. It is the biggest gap due to the asteroid belt

What would happen if the rate at which materials naturally move in or out of the atmosphere changed?

If the rate of materials entering or leaving the atmosphere changed significantly, it could disrupt the balance of gases in the atmosphere, leading to global climate change, altered weather patterns, and potentially harmful effects on ecosystems and human health. This could include increased greenhouse gas levels, changes in precipitation patterns, and alterations in atmospheric composition.

When will the five most visible planets be observable in the evening sky during the next 12 months in the year 2012?

As I write this on August 25, 2012, Mars and Saturn are clearly visible just above the western horizon at sunset. Venus is the "Morning Star", and is the brightest thing in the sky in the eastern sky just before dawn. Jupiter rises about 1AM, and is visible until dawn.

Mercury is tougher; it's currently too close to the Sun to be visible and is headed to a "superior conjunction" when Mercury will be on the other side of the Sun from us in mid-September. It will remain too close to the Sun to be visible until the end of October. By Halloween, you should have a chance to see Mercury low in the western sky just after sunset.

Who is the greatest person in universe?

You will get a different answer every time you ask the question "who is the greatest person in the universe." Many believe that their parents are the greatest people int he universe while other think it is a movie star or singer.

What would the seasons be like if the earth's axis of rotation were a 0?

If the Earth's axis of rotation were at 0 degrees (perpendicular to the plane of its orbit around the Sun), there would be no seasonal variation in temperature or daylight. This would result in constant temperatures and day length throughout the year, leading to a more uniform climate globally.

What is an object at a distance of 68 AU from the Earth?

All objects orbiting the Sun do so in an elliptical orbit. Therefore sometimes they are further away while at others they are closer.

To be 68 AU from the Earth you would need to know the position of the Earth relative to the said object as the Earth could be on the other side of the Sun.

The closest objects to 68 AU from the Sun would be Eris or 2007 OR10.

  • Eris: Aphelion 97.56 AU Perihelion 37.77 AU Semi major axis (Average) 67.67 AU
  • 2007 OR10: Aphelion 100.79 AU Perihelion 33.62 AU Semi major axis (Average) 67.21 AU

Does 200 years equal 1 light year?

No, 200 years does not equal 1 light year. A light year is the distance that light travels in one year, which is about 5.88 trillion miles. A year is a unit of time, so they are not directly comparable in terms of distance.

What is bigger?

It depends on what you are comparing. Can you provide more context or specific items to compare?

What are three reference points used to describe a star or planet's location in relation to a person's position?

This is probably about the "horizon coordinate system".

Or, it's sometimes called the horizontal coordinate system.

The system uses "altitude" and "azimuth" as coordinates.

The azimuth is normally measured from due North as zero.

So, that's the "three reference points", probably.

Altitude is the angular height of a star above the horizon.

Azimuth is the angle of a star measured along the horizon, from the pole.

How fast does the earth rotate around the sun at?

The Earth does NOT rotate around the Sun.

It has an orbital track, on which it takes one year to complete.

The Earth moves along that orbital track at approximately 66,000 mph (30 km/sec).

The Earth ROTATES on its own axis to give us night and day. This rotation has a speed of 1,000 mph at the Equator, 500 mph at 60 degrees N/S , and you rotate on the spot at the poles. (N/S).

Do the stars circle daily around north or south celestial pole?

First of all, we need to recall that none of this motion is real. It appears to us as if

the stars are circling in the sky, only because the Earth is spinning, carrying us along

with it, and spinning the direction in which our eyes point, once a day.

Unless you happen to be standing on the Earth's equator, you can only see one Celestial

pole ... either the north one or the south one, corresponding to which of the Earth's

hemisphere's you're standing in.

It seems to me that the stars appear to circle bothCelestial poles. If you open

a camera aimed at the night sky, and leave it open for a while, you always get

nice circular arcs traced by the stars. No matter which Celestial pole is visible

in the picture, the arcs of the stars will appear centered at it.

How many UniVerse developers are there in the World?

There is no specific number of UniVerse developers available as it varies over time. UniVerse is a niche technology and the exact number of developers actively working on it worldwide is not readily available.

Are all planets gravitating towards the sun?

Anything that has mass has gravity. The force is proportional to the mass and inversely proportional to the distance. In other words, the bigger the planet/object, the greater the gravity, and the larger the distance between two objects the less the gravity if felt.

What is differentiation when discussing planetary formation?

  1. The 'planet' undergoes intense bombardment and radioactive activity.
  2. The rock begins to heat and melt.
  3. The heavier metals heat and sink towards the center forcing the lighter rocks to float towards the surface.
  4. The planet cools and the rock layers solidify