Earth & Space

NASA and other scientists believe that they have found a new planet on the edge of the solar system, inside the Oort asteroid cloud.

The Sun has generated the first X-Class solar flare of Solar Cycle 24. While this will be an opportunity to test the radiation resistance of our satellites, for us on Earth it simply means that we could be treated to a showing of Northern Lights.

While humanity may strive to explore deep space, concerns about solar radiation may make it impossible for humans to explore beyond Mars.

Bill O'Reilly takes on all those pinheads who think that gravity is enuf. But in a fantasy smackdown with Richard Feynman, who fares better? Videos after the jump.

If Jupiter were the moon's distance from Earth, a changed night sky would be the least of our problems.

Remembering the Challenger disaster, 25 years later.

A normal, cyclical change in continental air pressure gradients has the world turned upside-down.

The godlike vision granted by our far-flung sensors.

In a lodge in the shadow of New Hampshire's Mount Washington, reading tales of the summit's almost-implausibly calamitous past.

Space race historian David Portree outlines the choices astronauts stranded in lunar orbit would have faced. Spoiler Alert: none of them are very good.