A group of comets with unexplained movements presents a quandary D avide Farnocchia hunts down and tracks asteroids, and ...

April 21 - 28 is International Dark Sky Week, a global celebration of the night sky during which like-minded organizations ...

A celestial shadow known as the Circinus West molecular cloud creeps across this image captured from Chile with the ...

Science and philosophy explain why a color is objectively real, even when people see the same shade differently.

By Aimee Ortiz For a few brief moments on Wednesday, a bright fireball lit up the predawn skies near Mexico City. The display awed residents and online viewers alike as videos of the object ...

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Did you know some of the brightest sources of light in the sky come from the regions around black holes in the centers of ...

If you place a gray object against a lighter background, it will appear darker than if you place it ... larger when it’s on the horizon than near its zenith. But the size of the moon doesn ...

A new trail in this southern Arizona city plots the most visitor-friendly astronomy stops—and there are plenty to choose from ...

Illegal detentions, wanton human rights abuses, including torture, killings, forced disappearances, impunity of security ...

Skywatchers throughout the Northern Hemisphere are enjoying views of the newly discovered Comet SWAN.