In recent decades, the moon has gathered a bit of invisible clutter.
It seems that at some point after astronauts visited the moon, a powerful moonquake sent boulders tumbling across the lunar surface. Here's what they tell us.
One of the year's brightest meteor showers is about to take flight. If you face cloudy or light-polluted skies at home, however, never fear — the Perseids will also be streamed online.
The U.S. Air Force's X-37B military space plane has now been circling Earth for 700 days, just a few weeks shy of the vehicle's spaceflight-duration record.
Supergravity has inspired physicists for decades and may contain deep truths about the nature of reality.
Native Hawaiians argue that the Thirty Meter Telescope, set for construction on the sacred site, was planned without care for their concerns.
An ancient star in the Milky Way holds traces of another star that was among the oldest in the universe.
This first-of-its-kind discovery reveals a new category of ultrahot exoplanet, one so thoroughly cooked that your cast-iron skillet would bubble, turn to gas and boil out of the atmosphere.
Are aliens using super powerful flashlights to get our attention? Astronomers think there's a chance they are.
Researchers have mapped the Milky Way in unprecedented detail using data from thousands of giant, pulsating stars.
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