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What else can I help you with?
A planet should not be considered a planet if it is only made of gas?
The definition of a planet has nothing to do with its composition. A planet is any spherical object orbiting the Sun that has cleared its orbit from other objects.
Why does Pluto not anymore considered as planet?
The definition of a planet was changed and it does not meet that definition.
What is the definition of artificial satellite?
An artificial satellite is a man made object that orbits a planet or a moon.
Does europa match the definition of a planet although it is a moon?
No. Europa does not meet the definition of a planet because it does not orbit the sun. It orbits the planet Jupiter.
What planet is made of mostly atmosphere?
None. By definition a rocky planet is mostly rock. Venus, by far, has the densest atmosphere of the terrestrial planets, but the planet itself is mostly rock and is similar in composition to Earth.
What does mercury revolve around?
Mercury is a planet. By definition, it revolves around the sun.
What is the definition of 'Earth'?
a round planet with living things on it.
What planet some astronomers don't think is a planet?
Astronomers have decided that Pluto does not meet the definition of a planet.
What is the definition of a Moon?
A moon orbits a planet.
What is the definition of a planet and how many planets are there?
8
What made scientists decide that a new definition of the term planet was needed?
When they discovered pluto did not follow the full criteria to be considered a planet. They needed a different scientific term to describe “planets” like pluto.
What planet is only one AU from the sun?
By definition, it's the Earth.
