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Earth is our home planet, and it's the only place in the universe where we know for certain that life exists. Earth formed over 4.5 billion years ago from a swirling cloud of gas and dust squished ...

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 ...

We have just entered a very favorable period for observing the so-called "elusive" planet Mercury. From now, until about May 13, you should be able to find it with not much difficulty. But how well do ...

CAPE CANAVERAL, Fla. (AP) — Talk about an Earth-shattering discovery. Scientists have spotted seven Earth-size planets around a nearby star, some or all of which could harbor water and possibly life.

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. With so many interesting solar system facts, we've narrowed them down to 25 of our favorites. Our ...

The planet is almost 25,000 miles around and 4.54 billion years old, and humans are still discovering some of the amazing secrets it's hiding. …and sometimes we may forget just how incredible our home ...