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

As the human race searches the cosmos for any sign of life, a ghostly pulse that is being emitted every 18 minutes has been ...

Astronomers are making significant strides in detecting an ancient signal from one of the universe’s most unexplored periods.

In 1977, a radio telescope in Ohio received a signal so powerful, so unnatural, that astronomer Jerry Ehman scrawled one word ...

In 1977, astronomer Jerry Ehman discovered the mysterious “Wow! Signal” — a powerful radio burst from deep space at the hydrogen line frequency. Nearly five decades later, scientists believe the newly ...

Japanese scientists simulated faint 21-centimeter radio waves from the Universe’s “Dark Ages,” offering a potential way to detect dark matter. About 13.8 billion years ago, the Universe emerged in a ...

The Milky Way contains a modest amount of alien civilizations, a new paper proposes — and there's a reason we aren't seeing ...