All the planets are very old since they formed at the same time - roughly 4.5 billion years ago.
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The first inner planet is Mercury. It is the closest planet to the Sun in our solar system and is known for its extreme temperature variations, ranging from very hot to very cold.
It is the hottest planet, and it is very rocky with many craters. It is terrestial and the closest to the sun and also the smallest planet.
Near the Sun the force of gravity is very strong so the planet has more energy which means it has to move faster.
The planet with the axis of rotation which gives it almost no tilt is "Mercury". "Mercury's" axis of rotation has a tilt of 0 degrees. The planet "Jupiter" has very little tilt due to its axis of rotation at only 3 degrees.
it's very very new! I just got it for my xbox 360
Jupitar planet is very big.
There is no possible sugested name for an old planet.
Jupiter, Saturn and Uranus have MORE that 21 satellites.No planet has just 21 satellites - unless your are reading from a very old text book.
it is a very rocky planet
mars
I think the planet you are thinking of is Mercury.
if we didn't have an atmosphere during the day our planet would be very hot and during the night our planet would be very cold
Because Pluto is very very very small and the smallest planet in our planetary system
Because of quantum mechanics, anything is possible. However, it is very, very, VERY unlikely that any planet will explode.
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Mercury is the closest planet to the Sun and has a very small atmosphere.