Posts by 

Deborah Byrd

Probing the Hubble Ultra Deep Field

Astronomers used an instrument called MUSE to conduct the deepest-ever spectroscopic survey. The result was a bonanza of new knowledge.

Most blue whales are ‘right-handed’

Of course, they don't have hands. But scientists used motion-sensing tags to show that most blue whales roll to the right as they feed – except when swimming upward.

Early morning halo over Idaho

Sheryl R. Garrison in north Idaho wrote: "This morning began with a stunning sunrise followed by a beautiful 22-degree halo over the Pend Oreille river."

Now we know Earth blocks neutrinos

"This achievement is important because it shows, for the first time, that very-high-energy neutrinos can be absorbed by something -- in this case, the Earth."

Say farewell to Venus

Did you see the conjunction of Venus and Jupiter before sunup around November 13? Since then, Jupiter has been climbing away from the sunrise, while Venus has been falling toward it.

Waving hi to ISS

Karthik Easvur created this image as the International Space Station soared over Hyderabad, India on November 22. How you can spot it. Plus, who's aboard ISS now?

Our nights are brighter, and brighter

The International Dark-Sky Association has campaigned for decades to reduce artificial light at night. Yet a new study shows our night skies still brightening at a rate of 2 percent each year.

Cloud-to-cloud shadow over China

One morning over Hong Kong, a striking shadow cast from one cloud to another. Photos by Cammy Li. Explanation by Matthew Chin.

Last night’s moon, Saturn, Mercury

If you've been watching the west after sunset, you know the young moon is back. It has swept past the planets Saturn and Mercury and still hovers not far from them, with its lighted face pointed toward them.

Flowing sand, not water, on Mars

The dark streaks on Mars known as recurring slope lineae are likely the result of repeated avalanches of sand and dust, rather than seeping water, new research shows.

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