A faint radio "whisper" from ancient hydrogen reveals the universe was heating up long before it filled with starlight.

The origin of our Universe remains one of the greatest enigmas of science, a question that seems to defy the limits of our physical understanding. For decades, cosmologists have struggled with the ...

The early universe was already warm before reionization, revealing that the first stars did not flicker on in an icy cosmos.

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After the Big Bang, dark matter clumped together, traces of which are said to exist. Because they cannot be detected from ...

Most cosmologists believe that these stars were the first large, free-floating structures to illuminate our universe, and that black holes appeared later. But some have proposed that it went the other ...

Astronomers examining data from the James Webb Space Telescope say they’ve spotted what might be the oldest black hole in the universe, born less than a second after the Big Bang. Their findings, ...

It signifies the end of the Cosmic Dark Ages, roughly a billion years after the Big Bang, when the gas between galaxies shifted ... to observe the sky for longer than we ever have before. That's the ...