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5 new pairs of merging supermassive black holes
Merging black holes are the sorts of catastrophic events that produce the strongest gravitational waves. Scientists just announced 5 new pairs, in the centers of distant galaxies.
October 8, 2017
Nobel winners shed light on circadian rhythms
Three American scientists share the 2017 Nobel Prize in Physiology or Medicine for work that explained how our cells keep track of time.
October 8, 2017
Moon’s lit side points to Aldebaran
Watch the moon travel toward Aldebaran in our sky's dome, throughout the night of October 8. Then come back a night later, and see how far the moon has moved.
October 8, 2017
Close encounters of the planet kind
Brilliant Venus and faint Mars swept close last week, in the east before sunup. Check out these awesome photos!
October 7, 2017
See it! 2017’s Harvest Moon
Photos and videos from the EarthSky community of 2017's Harvest Moon. Thanks to all who submitted photos, or posted them to EarthSky Facebook!
October 6, 2017
Help identify Earth features in astronaut photos
Hey citizen scientists! You're invited to test a new tool to study Earth using photos taken by International Space Station astronauts. Here's how.
October 6, 2017
Harvest moon mirage
When you look over an ocean at a distorted sun or moon, the reason is most often that the low slanting rays of the object are being highly refracted between air layers of different temperatures.
October 6, 2017
Is dust what’s dimming Tabby’s Star?
Astronomers say they've found a smoking gun that rules out the idea of an energy-harvesting megastructure or Dyson sphere - built by an alien civilization - surrounding Tabby's Star.
October 5, 2017
Anticrepuscular rays at Georgia moonrise
Scott Kuhn captured anticrepuscular rays as the moon was rising over Fort Mountain in northern Georgia.
October 5, 2017
On October 5, the Harvest Moon
The Northern Hemisphere's Harvest Moon is the full moon closest to the September equinox. It's tonight! Watch for it.
October 5, 2017
