NASA says 2nd-warmest year on record. NOAA says 3rd-warmest. Their methodologies differ slightly, but - by both standards - the 2017 results make the past 4 years the hottest yet recorded.
Scientists used the Blue Waters supercomputer to show that a black hole's relativistic jets and accretion disk both may be spinning - and precessing over time - around an axis separate from the black hole itself.
On Sunday morning, Jupiter and Mars were half a moon-diameter apart. Now the moon is sweeping past. Plus Mercury and Saturn are in conjunction this weekend. Photos here.
Where do stars we see at night come from? Newly confirmed streams of stars - thought to be coming to our Milky Way from other galaxies - suggest not all Milky Way stars were born here.
Astronomers and visualization specialists at NASA have just released this unprecedented, 3-dimensional, fly-through view of the Orion Nebula, a nearby star-forming region.
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.
EarthSky Newsletter
Nearly half a million daily subscribers love our newsletter. What are you waiting for? Sign up today!
Join now to receive free daily science news delivered straight to your email.