Mars

How old is Mars?
Was life discovered in a meterorite from Mars?
How did Mars and its moons get their names?
Who discovered Mars?
Is there really a giant canyon on Mars?
When did the first robot rover go to Mars?
Is there life on Mars?
What is the temperature on Mars?
Can we breathe on Mars?
Does Mars have an atmosphere?

Is there water on Mars?
How bad are the dust storms on Mars?
Does Mars have any moons?
How long does it take Mars to go around the sun?
How long is a day on Mars?
How strong is the gravity on Mars?
How large is Mars compared to Earth?
When did we first land a spacecraft on Mars?
What is the highest mountain on Mars?
Why is Mars reddish?

How large is Mars compared to Earth?

Mars has a diameter of 4,222 miles (6,794 km) which makes it a little more than half (about 53%) the diameter of Earth. It has about one-ninth the mass of Earth.