Why is Venus' surface hotter than Mercury's?

What type of fault is when plates are moving away from each other?

What can protect planets from solar wind?

What is the biggest terrestrial planet?

What terrestrial planet (other than earth) is most likely to have water on it?

Which of the following planets has frozen ice caps?

Which planet has nitrogen as the majority of it's atmosphere?

What is the majority chemical in Mars' atmosphere?

What planet has the largest orbital radius?

What do we call the outer four planets?

What is the "brightest" planet in the sky?

What are the three main substances that make up the outer planets?

Which planet takes the longest to rotate at 243 days?

Which planet is considered Neptune's twin?

The surface of mercury is most similar to

The planet known as earth's evil twin is?

Which gas gives blue planets their color?

Saturn's rings are mostly made of _________

What is the largest planet in our solar system?