The European Space Agency's Mars Express orbiter captured this view of Mars' south polar ice cap Feb. 25, 2015. Three years ...

The textbook assumption is that when the first modern humans arrived in Europe, around 45,000 years ago, they quickly evolved ...

Saturn stunned skywatchers on 23 November when its iconic rings seemed to vanish, leaving the planet looking strangely bare.

As winter's shorter days and longer nights arrive, many experience a dip in mood and energy, potentially indicating winter ...

Learn when fall begins with the autumnal equinox. Get upcoming dates, Harvest Moon info, and understand meteorological vs ...

A high-altitude mass of volcanic ash and fumes from Sunday morning's eruption of the Hayli Gubbi volcano in northern Ethiopia ...