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. In 1965 ...

Discover interesting facts about how Earth formed, what it's made of and more.

Mercury is putting on a show for skywatchers in the evening sky after sunset. But how well do you know the planet Mercury? Here's some Mercury trivia to ponder while planet gazing.

Our solar system's planets vary greatly in size, composition, temperature, chemistry and geology. Here are some notable extreme facts about the planets that orbit our Sun.

Get excited about Earth Day with these interesting facts about the world. Traveling to new places always expands the mind, but some of these facts might not be learned on vacation. Earth Day is on ...

American astronomers say they have found strong evidence that a ninth planet might exist in our solar system. Here are nine things we know about 'Planet Nine'.

American astronomers say they have found strong evidence that a ninth planet might exist in our solar system. Here are nine things we know about 'Planet Nine'.