How hot is Mercury?
Why does Mercury have more craters than the other planets?
How small is Mercury compared to Earth?
How strong is the gravity on Mercury?
How close is Mercury to the sun?
How fast does Mercury orbit the sun?
How long is a day on Mercury?
How long is a year on Mercury?
How far is Mercury from Earth?
Does Mercury have an atmosphere?
What is the weather like on Mercury?
What does the sun look like from Mercury?
What is Mercury made of?
How old is Mercury?
How many spacecraft have been to Mercury?
Who discovered Mercury?
How did Mercury get its name?
How long does it take to get to Mercury from Earth?
Is there any water on Mercury?
What color is Mercury?