Astronomers posed over the past decade that dark comets, or objects that resemble asteroids but move like comets, may exist.

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A ‘winter wonderland’ is shown in a deeply mysterious place 140 million miles from Christmas — the surface of Mars.   At ...

The European Space Agency’s (ESA) Mars Express orbiter captured stunning views of a winter wonderland on Mars, but this isn’t ...

Snow dots the Martian landscape in these images from ESA's Mars Express orbiter and NASA's Mars Reconnaissance Orbiter.

it was cold enough for water to freeze into ice. "Dark comets are a new potential source for having delivered the materials ...

Australe Scopuli showcases Mars' icy layers and dust jets formed by seasonal sublimation. Stunning fan patterns highlight ...

Instead of a winter wonderland, the Red Planet's northern hemisphere goes through an active—even explosive—spring thaw. While ...