Stone tools unearthed in a quarry in Ukraine belonged to ancient humans who used them more than a million years ago, according to new research. The fresh dating analysis of the artifacts reveals the ...

Scientists using quasars as cosmic clocks have observed that when the universe was just a billion years old, time ran five times slower, helping to confirm Einstein's general theory of relativity and ...

(CNN) — Scientists have peered into the early days of the universe, when it was about 1 billion years old, and discovered that things moved in slow motion compared with now. (CNN) — Scientists have ...

A new simulation shows how NASA’s Nancy Grace Roman Space Telescope will turn back the cosmic clock, unveiling the evolving universe in ways that have never been possible before. A new simulation ...

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