Sejal, age 7, Bangalore, India The planet Jupiter has no solid ground – no surface, like the grass or dirt you tread here on Earth. There’s nothing to walk on, and no place to land a spaceship.

Telescopes show Earth's sister planet swelling to an apparent diameter wider than Jupiter, while its phase thins dramatically from 37% to 15% lit. Soon after sunset on Feb. 1, direct your ...

When two giant planets collide, an even bigger world may be born. Based on new simulations, scientists believe that giant gas planets across the universe can often collide and merge into even ...