More evidence for a Planet 9

No new large planet on the outskirts of our solar system has yet been discovered, although evidence is building, astronomers say. By the way, if Planet 9 does exist … it's definitely not headed our way.

Gravitational waves: What are they?

If you understand how a trampoline works, you'll be able to understand what gravitational waves are.

Gravitational waves, and more, from merging neutron stars

On Monday, LIGO and Virgo announced the 1st detection of gravitational waves produced by colliding neutron stars, and 1st observed in both gravitational waves and light. "It ushers in a new era in astronomy."

The UK had a red sun Monday

Social media was buzzing on Monday with photos and accounts of the red sun over the UK. British weather forecasters said it was dust from the Sahara, raised via Hurricane Ophelia.

Creatures raft across Pacific, thanks to tsunami

Hundreds of species hitched a ride on debris from the 2011 Japanese tsunami for a 4,400-mile journey across the Pacific Ocean.

ISS over Puget Sound, Washington

Photographer John Nelson used NASA's SpotTheStation website to learn when the International Space Station would make a high pass in his sky. This image is the result.

Asteroid to sweep close October 11-12

Asteroid 2012 TC4 is being used as a test of Earth's global asteroid defense system. How to see it online.

Penetrating the mystery of why we age

Researchers in Germany call the aging process "a quirk of evolution" and take a step forward in understanding why we didn't evolve to live forever.

How gravitational waves attracted a Nobel Prize

The 2017 Nobel prize for physics was awarded to scientists who helped pioneer the discovery of ripples in the fabric of spacetime, known as gravitational waves. 

Nobel winners shed light on circadian rhythms

Three American scientists share the 2017 Nobel Prize in Physiology or Medicine for work that explained how our cells keep track of time.