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Centaurus A's Warped Magnetic Fields
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Planet Earth at Blue Hour
Nature photographers and other fans of planet Earth always look forward to the blue hour.
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Unusual Signal Suggests Neutron Star Destroyed by Black Hole
What created this unusual explosion?
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Anticrepuscular Rays Converge Opposite the Sun
Is there ever anything interesting to see in the direction opposite the Sun?
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NICER at Night
Neutron star Interior Composition Explorer (NICER)
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Astronomy Picture of the Day: Spiraling Supermassive Black Holes
Do black holes glow when they collide? When merging, co-orbiting black holes are sure to emit a burst of unusual gravitational radiation, but will they emit light, well before that, if they are surrounded by gas?
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Astronomy Picture of the Day: Cherenkov Telescope at Sunset
On October 10, a new telescope reflected the light of the setting Sun.
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Astronomy Picture of the Day: Cosmic Collision Forges Galactic Ring
How could a galaxy become shaped like a ring?
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Astronomy Picture of the Day: A Powerful Solar Flare
It was one of the most powerful solar flares in recorded history. Occurring in 2003 and seen across the electromagnetic spectrum, the Sun briefly became over 100 times brighter in X-rays than normal.
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Astronomy Picture of the Day: Sea and Sky Glows over the Oregon Coast
Every step caused the sand to light up blue. That glow was bioluminescence -- a blue radiance that also lights the surf in this surreal scene captured last month at Meyer's Creek Beach in Oregon, USA.
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