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

On human timescales, the universe may as well be eternal. It’ll be here long after our species and our planet are gone, but ...

We know how the universe began. An event we call the Big Bang started it all about 13.8 billion years ago. How the universe ...

When discussing the scale of the universe, we’re immediately faced with an intriguing question: are we tiny beings, or is the ...

We’ve grown up with the idea that the universe will expand forever, meaning the "cosmological constant" is positive. What if it's negative?

For two decades, scientists believed the cosmological constant, known as λ (lambda), was positive. That meant the Universe ...

After a century of observations spanning the breadth of the cosmos and theoretical insights that push humanity's vision of ...

According to the equations that govern black holes, the larger one of these cosmic behemoths is the lower its average density ...

Even before the first stars lit up the Universe, the Cosmos was not the cold place most researchers once imagined. New ...