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"Planet" is a definition that astronomers have assigned. A planet is a celestial body that must meet the following requirements:
-it is orbiting a star or stellar remnant
-it has cleared its orbit of planetesimals
-is massive enough to be rounded by its own gravity but not massive enough to cause thermonuclear fusion.
If the celestial body in question does not fit all of the requirements listed above, then it does not fit the definition of a planet.
What else can I help you with?
How can you determine the actual masses of planets?
the effect it has on other planets
Are the pictures of the planets on Google Earth actual or animated photos?
They are real photos
What is the surface temprture of the planets?
Depends on the planet's distance from the Sun. Look up references to the Solar System or to its individual planets for the actual values.
Are planets hot?
Some planets are hoot, some are cold, and some have moderate temperatures.
Which galaxy are planets in?
It is possible that every galaxy has some planets. We just are starting to detect some planets in other galaxies.
How are other planets compared with earth?
some planets are bigger and some are smaller. some have different atmospheres. some of the planets are almost pure gas. some planets have as much as like 60 moons while ours only has one
Is there a new planet that's habitable?
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.
How many earths is it in the universe?
It is currently unknown how many Earth-like planets exist in the universe. Scientists have discovered thousands of exoplanets, some of which may have conditions favorable for life, but the exact number of Earth-like planets is still uncertain due to the vastness of the universe.
What were the planets named after?
Some of the planets were named after greek or roman gods.
Do some planets have arms?
No.
Why are some of the planets in your solar system called the inner planets?
Because they are in the asteroid belt. The planets that are outside of the asteroid belt are called the outer planets.
Why are some planets bigger than other?
because when god made the planets he made explosions everywhere to make planets. some explosions were bigger than others.
