Clouds drifted in and out of the D.C. area before dawn Friday, offering enough open sky for photographers around the region to capture views of the total lunar eclipse. The spectacle began at 11:57 p.

A recent video created from images captured by Curiosity shows clouds tinted red and green flowing though the sky over Mars. Captured using the rover’s Mastcam instrument on January 17 ...

known as the cosmic microwave background radiation (half-sky image on the left, closeup on the right). Orange and blue ...

Kelvin Helmholtz clouds are named after the two scientists who studied the physics behind them A rare cloud formation resembling waves in the sky has been seen across North Yorkshire. The billowy ...

Eventually, the dark umbra shadow appeared and slowly enveloped the moon, until we saw the distinctive color at totality when ...

Research by the Atacama Cosmology Telescope collaboration has led to the clearest and most precise images yet of the universe’s infancy, the cosmic microwave background radiation that was visible only ...