Posts by 

Deborah Byrd

Circumhorizontal arc over Argentina

Don't call them "fire rainbows," experts say. They're not rainbows. And they originate with ice, not fire.

Blue Origin soft-lands a rocket!

And Jeff Bezos, which founded the private spaceflight company, sends his first-ever tweet. Congratulations, Blue Origin!

Weather-related natural disasters are up

With COP21 poised to begin in Paris, a new UN report suggests that weather-related disasters were nearly twice as frequent over the past decade as two decades ago.

The Cheshire Cat group of galaxies

A lot of dark matter lies between us and these distant galaxies. Light distortion from gravitational lensing creates the "cat."

Day on Pluto, day on Charon

Best currently available images of Pluto and Charon - taken during New Horizons' flyby - combined to create a view of a full rotation of each of these worlds.

A nearby dark matter galaxy?

Measurements of the velocities of just six stars in a galaxy of only 1,000 visible stars suggest the highest concentration of dark matter of any known galaxy. Holy grail? Or is there another explanation?

Hole-punch cloud over Massachusetts

Hole-punch clouds are sometimes called fallstreak holes. They are often-circular patches of clear sky, surrounded by clouds. Airplanes create them.

Texas telescope to explore dark energy

A mysterious and largely unknown dark energy is thought to pervade our universe. A telescope in West Texas is poised to survey a million galaxies, to explore it.

Cloud shadow

The sun is behind the cloud. It looks as if the shadow is also behind the cloud, but that's just a trick of perspective.

Taurid fireballs photos and videos 2015

The Leonids were sparse this year, but 2015 has been an incredible year for the long-lasting shower Taurids. Photos and video here.