Think back to what you learned about astronomy in elementary school. If you’re like most people, you may have had to memorize the order of the planets, or perhaps even make some kind of diorama of our ...

Ah, Earth. We may not think about our planet on a day-to-day basis, but the world we live in is a pretty interesting place. The third rock from the Sun—and to this day, the only one with known ...

Geology rocks. Geography, on the other hand, rules. Here are a bunch of facts about stuff that I think you might want to know. Or not! But if you want to seem smart and cool, I'd memorize all these ...

How far it is from the sun: 886 million miles (1.4 billion kilometers), on average How big it is: 72,400 miles (116,500 km) across, or almost 10 times the size of Earth. How many moons it has: At ...

Mars, the fourth planet from the sun, is a dry, rocky world. Its famous red color has earned it the nickname the Red Planet. Mars has fascinated people throughout history, and today, it is one of the ...

Space! It's been called the "final frontier." It's powerful, infinite and some would say unknowable. But astronomer Dean Regas is not among them. As he says in the forward to his new "1,000 Facts ...

Mars is a fascinating planet in our solar system. Over the years, space organizations have done a great deal of work to further explore Mars, including projects to get crews to the red planet. Mars ...