The brightest star in the night sky is Sirius, aka the Dog Star. Sirius is so dazzling because, at only 8.6 light years away, it is one of the closest stars to Earth.

It is a glow-in-the-dark night sky too, colored a mix of green, yellow and red. Its colors result from scattered sunlight, oxygen, and sodium from shooting stars.

A mysterious spiraling blue light illuminated the night skies over Europe on Monday. The cosmic whirlpool was captured in stunning video and appears to have been created by the SpaceX Falcon 9 ...

Extremely rare, vibrant "moonbows" were spotted in the night sky above the U.S. shortly before the rise of the blue supermoon on Monday (Aug. 19). The moon will remain bright for the next few ...

A SpaceX rocket launch from Florida on Monday afternoon produced a dazzling display in the night sky above Europe, leading to some people asking Elon Musk what they were witnessing.

Astronomers have spotted another never-before-seen "nova" blaze to life in the night sky. This may be the first time that ...

Why is the sky blue? – Mariana A-E., age 11, ... It is as if the tennis balls are very selective in terms of which marbles they eat, and they prefer the blue ones over the other colors.