The planet that has nearly the same diameter as Earth is

It is difficult for astronomers to study Mercury because

The high temperatures on Venus' surface is due to

What are Venus' clouds made of?

Which is a correct comparison of daytime and nighttime temperatures on Mercury?

What two gases make up most of Earth's atmosphere?

What is Jupiter's atmosphere composed of?

Saturn's rings are made of

In a geocentric system,

What is an ellipse?

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