It's a spacecraft shadow on a comet! Rosetta caught its own shadow encircled in a wreath of light, on the icy surface of Comet 67P/Churyumov-Gerasimenko.
Beautiful photos of the March 2, 2015 moon and Jupiter. Our thanks to all who posted at EarthSky Facebook and G+, and submitted directly to EarthSky.org.
A black hole 12 billion times more massive than our sun - at the heart of the brightest quasar in the early universe - as the dark ages of the universe were just ending.
The comet was 51 million miles from Earth at the time – a short distance for the Dark Energy Camera, which is sensitive to light 8 billion light-years away.
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.