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.

Here's a look at our solar system, from the scorching surface of Venus to the home of the largest volcano.

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 ...

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Nicknamed "Planet Nine," the world is a behemoth - about 10 times the mass of the Earth. It would take the planet between 10,000 and 20,000 years to orbit the sun.

Discover interesting facts about Mars, its moons, its atmosphere, and the possibilities of life.

Weird giant may be the first known alien moon Evidence is mounting that a world the size of Neptune could be orbiting a giant planet far, far away.

Read these 75 interesting and cool facts about Earth to learn more about our planet.