Author: Doyle Rice, USA TODAY

The colossal, long-extinct beast lived 5 million to 10 million years ago and measured at 9 1/2 feet – roughly the size and shape of a midsized car.

Researchers studied recent extinctions from climate change to estimate how many species would be lost over the next 50 years.

The new decade is off to a hot start. The Earth just had its warmest January on record, scientists announced Thursday.

Pine Island is one of the fastest-retreating glaciers in Antarctica, NASA says. The break-off is “both terrifying and beautiful,” one scientist said.

For the first time, scientists have detected a radio signal from outer space that repeats at regular intervals.

A rare winter storm coated Baghdad in snow Tuesday morning for only the second time in the Iraqi capital in the past century.

Antarctica made worldwide news when one location – an Argentine research base – set a record high temperature for the continent of 64.9 degrees.

Strange ice rings in Siberia’s Lake Baikal have puzzled scientists for decades, but now the mystery apparently has been solved.