Learn about the solar system in our new What If song. Explore planets, moons, and cosmic wonders through music and imagination.

Our solar system is suspended in a delicate balance of massive forces. Introduce a new terrestrial planet into that equation between Mars and Jupiter, and it could jettison the Earth out of the solar ...

In Liu Cixin's short story "The Wandering Earth (opens in new tab)" (first published in Chinese magazine Science Fiction World in July 2000), Cixin portrays a scenario in which the planet's leaders ...