Jupiter's moon Io has active volcanos spewing gases into its thin atmosphere. As Io moves in and out of Jupiter's shadow, its atmosphere collapses and then repairs itself.
Astronomers thought the star AR Scorpii was a lone variable star. Now they realize it's a dwarf star bombarding its companion with relativistic electrons.
New moon is August 2, 2016. The next few evenings are a wonderful time to go out in the country for an edgewise view into our own galaxy, the Milky Way.
Earth's shadow is a blue-gray line ascending in the east each evening, as the sun sinks below the western horizon. Belt of Venus is a pink line above the shadow.
A 1,600-foot (500-meter) dish called FAST - in southwest China - is now the world's largest radio telescope. It's expected to be fully operational in September.
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.