The idea of waging war in orbit is no longer a figment of science fiction. As satellite technologies and launch capabilities ...

A newly studied solar system breaks the usual planet pattern, raising fresh questions about how rocky and gas planets form.

How big would a telescope need to be to see Earth’s dinosaurs from 66 million light-years away? Think big—and then think ...

Precious metals may be escaping from the planet’s core. This hotly debated subject could help us understand Earth’s evolution and determine whether life exists elsewhere in the Universe ...

A distant planet’s final spiral into its star reframed Earth’s fate: not one sudden end, but long quiet thresholds over deep time.

With Area 51 ruled out by President Obama, where might aliens really be hiding? Scientists have now revealed the best candidates.

They show up as a mathematical solution in general relativity, basically as a time-reversed version of a black hole. Some ...

The geoid (the surface of equal gravitational potential of a hypothetical ocean at rest) serves as the classical reference ...

A distant star dimmed by 97% for nearly 200 days. Astronomers say giant rings around a brown dwarf or super-Jupiter may explain it.

Just days ago the moon traveled directly between Earth and the sun in what was the first solar eclipse of the year, producing ...

The Himalaya is facing a snow drought where winter snowfall arrives months late and summer heat comes early. Is the snowless ...