APOD Science APOD APOD: 2026 September 17 – A… Today’s APOD Archive Submissions Index Search Calendar RSS Education About Discuss…
Earth Observatory Science Earth Observatory Summer Goes Out With a Heat Dome Earth Earth Observatory Image of the Day EO…
New research suggests that some unusual characteristics of the Sun may be explained if it swallowed a large planet sometime…
The rough, impact-debris-covered surface of Mercury has hidden the true rate at which Mercury has been shrinking, which scientists previously…
Astronomers know that stars can engulf planets when they stray too close. But how can they know, by looking at…
Detective work by a team of space-weather experts has discovered the truth about a historical event that had been thought…
4 min readPreparations for Next Moonwalk Simulations Underway (and Underwater) Derek Abramson, Dale Reed Subscale Flight Research Laboratory chief engineer,…
The U.S. military must be ready to engage the enemy farther from home than ever before, according to its highest-ranking…
The winners of the first-ever Neil Armstrong Space Prize just got their hardware.Those awardees — the people who developed and…
How small can brown dwarfs be before the definition breaks down? That question is at the heart of new research,…