Arizona's dark skies are a haven for astronomers and photographers. Some communities are fighting to keep them that way.

Stargazers in parts of the U.S. have a fleeting opportunity this month to catch a rare celestial phenomena—a "parade" of ...

Fluffy strands of cosmic gas and dust illuminated by bright young stars form a beautiful cloudscape in a neighboring nebula.

A breathtaking new image of the RCW 38 star cluster showcases a cosmic nursery bursting with color, light, and energy.

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