Aside form Earth, which inner planet once had liquid water on its surface?

What shape are the orbits of most comets?

Meterorids usually come from ________.

One of the conditions required for life on Earth is ________

What do all of the inner planets have in common?

Which is the smallest terrestrial planet?

Earth and Venus are much alike in terms of

When a meteoroid enters Earth's atmosphere, it produces a streak of light called

The asteroid belt is located

The atmospheres of the gas giant planets cannot escape into space becasue

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