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How outdated is the ice on the north pole of Mars?

On Earth, examining ice core samples is one of many methods that scientists are using to reconstruct the history of our past climate change. The same is true of the northern polar ice cap of Mars, which consists of many layers of frozen…

The Crab Nebula seen in Three dimensions

The Crab Nebula is arguably one of the most famous objects in the night sky. It was described as the M1 in Messier's famous catalog. They are the remains of a supernova that was actually visible during the day almost 1000 years ago. And…