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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.
Brilliant Venus and faint Mars swept close last week, in the east before sunup. Check out these awesome photos!
EarthSky is happy to announce our latest initiative EarthSky Cares. A percentage of proceeds collected through this sale will be donated to select organizations. Click here to help us make a difference in our world today!