Mars is also nice and close and we can use telescopes to watch the upper atmosphere. We have one moon. Mars has two. The two moons are Phobos and Deimos. Phobos, the biggest, is only about 7 miles across.
Scientists think it is an old asteroid that took up an orbit around Mars millions of years ago.
That's another thing about Mars, not only are its moons smaller, the planet itself is only about half as large as Earth. Covered with reddish rocks, it is our closest neighbor in the solar system. It's only about half the size of Earth. You can see more pictures of Mars at WWW.NASA.GOV . Andrew Rader Studios, All rights reserved.