earth

Don't worry: Astronomers say asteroid 2014 JO25, which is more than a third of a mile wide, will fly harmlessly past our planet. Still, it should come close enough to be visible with small telescopes.

The asteroid smashed into Earth. And from miles under the Earth's surface, rock hurtled upward to a height twice that of Mount Everest and then collapsed outward to form a ring of mountains.

And in further good news: You'll be able to see a supermoon every month for the next three months.

Stargazers, get ready for something spectacular on Thursday. The annual Perseid meteor shower, already one of the most reliably impressive celestial events, promises to be especially good this year.

During his 340 days aboard the International Space Station, the astronaut documented his time there with hundreds of photos. Kelly says the perspective makes him feel like an environmentalist.

The photos come from a camera on a satellite, once called "GoreSat" after former Vice President Al Gore, who initially proposed the project in the late 1990s.

In this solar system, Jupiter is about the size of a miniature watermelon. The sun is a small weather balloon. And the orbits, traced onto a dry lakebed, are huge.