Test your knowledge on our solar system, from the biggest and smallest planets to the behemoth mountain on Mars.

Most planets that we find outside of our solar system are already fully formed, with their birth materials long since ...

Want to see Mars at its brightest in January? The best telescopes for seeing planets give you the clearest views of our celestial neighbors. The new year is a great time to test out your ...

Encountering Neptune in 1989, NASA’s Voyager mission completed humankind’s first close-up exploration of the four giant outer ...

Companies like SpaceX, Blue Origin, and Rocket Lab are transforming the space race, offering new opportunities for research, communications, and even the prospect of colonizing other planets.