"Because Alpha Centauri is so close, it's our first stop outside our solar system. There are almost certain to be small, rocky planets around Alpha Centauri A and B."
"These professional astronomers are claiming the exclusive right to give 'approved' names to the stars. But the stars - and the sky - belong to all of us."
When you see the sky's brightest star - Sirius - low in the sky, you're seeing it shine through an extra thickness of Earth's atmosphere. At such times, its colorful flashing might surprise you.
The 2017 Geminid meteor shower was thought to have a better-than-average chance of producing a rich display, since the Geminids' parent body - a strange rock-comet called 3200 Phaethon - is nearby. And so it was! Photos here.
"For the first time, we are not only visualizing the detailed structure of our Local Supercluster of galaxies, but we are also seeing how the structure developed over the history of the universe."
Halos around the sun or moon are caused by ice crystals, like those in high cirrus clouds. Sometimes you can't see clouds, but - in these photos - you can.
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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