Is there a 9th planet out there? We may soon find out. Earth is a geological oddball in our solar system. This is why. Earth is a geological oddball in our solar system. This is why. This image ...

Astronomers have discovered a panoply of new moons orbiting Saturn, bringing the ringed gas giant's total up to 274 moons—far ...

Test Your Solar System Smarts From white dwarfs to space junk, our solar system is filled with mysterious and often mind-blowing phenomena. Do you know asteroids from meteoroids and Venus from ...

With a radius of 2,106 miles, Mars is the seventh largest planet in our solar system and about half the diameter of Earth. Its surface gravity is 37.5 percent of Earth’s. Mars rotates on its ...

With next-generation telescopes, tiny space probes, and more, scientists aim to search for life beyond our solar system ... in the March 2019 issue of National Geographic magazine.

Hubble also measures the atmospheres of planets outside our own solar system, exploring their compositions and building data that could someday aid the search for extraterrestrial life.

Total solar eclipses aren't something you see ... So, I contacted Babak Tafreshi, a National Geographic photographer who has been snapping eclipse shots for 30 years. With Tafreshi's advice ...