Sirius, the sky's brightest star, is sometimes called the Dog Star because it's in the constellation Canis Major, the Greater Dog. In this Chinese Year of the Dog ... a photo from Hong Kong.
In the 1980s, Voyager 2 discovered a dark storm in Neptune's dense atmosphere, and now the Hubble Space Telescope is tracking Neptune's storms. More in this NASA video.
For decades, astronomers have been talking about of galaxies with supermassive black holes at their cores. Now they say they've clearly confirmed a black hole's encircling, dusty, spinning disk of gas.
As the young moon receded from Earth and began spinning more slowly, its large equatorial bulge would have shrunk, cooled and hardened. Today, this fossil bulge on the moon tells a story about the early solar system.
An astrophotographer in Alamosa, Colorado, went outside before dawn to clear the snow. Then he noticed the moon and Saturn. That image and more, below.
Deborah Byrd (asteroid 3505 Byrd) helps edit EarthSky.org and is a frequent host of EarthSky videos. Deborah created the EarthSky radio series in 1991 and founded EarthSky.org in 1994. Prior to that, she had worked for the University of Texas McDonald Observatory since 1976, and created and produced their Star Date radio series. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named in her honor in 1990, a Public Service Award from the National Science Board in 2003, and the Education Prize from the American Astronomical Society in 2020. A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. "Being an EarthSky editor is like hosting a big global party for cool nature-lovers," she says.
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