Standard cosmology calls for many more dwarf galaxies than we see. A new computer simulation suggests we might not need so many dwarf galaxies, after all.
Summertime sea ice in the Arctic reached a minimum on September 10 (unless it goes lower still). It's now tied for the second-lowest minimum in the satellite era.
Satellite images of the crack in Antarctica's Larsen C ice shelf. If it breaks off, it'll make an ice island in the Southern Ocean as large as one of the smallest U.S. states.
"Who would have thought that Pluto is a graffiti artist, spray-painting its companion with a reddish stain that covers an area the size of New Mexico?"
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.