Learn how many stars there are in the Milky Way, and how astronomers count them.

If recent discoveries that dark energy is evolving hold any water, our Universe will collapse under its own gravity on a ...

The team explores one of the greatest discoveries of modern astronomy - that our universe is expanding - and the new ...

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 ...

The story begins with the black hole information paradox. According to relativity, anything that falls into a black hole is ...

The universe is approaching the midpoint of its 33-billion-year lifespan, a Cornell physicist calculates with new data from ...

Astronomers have detected one of the darkest objects ever seen at a record cosmic distance—only with the assistance of ...

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

Not all stars are created equally. Astronomers believe that the first stars to form after the Big Bang were mostly made of ...

Did stars and galaxies give rise to black holes, or was it the other way around? New research may challenge ideas about how ...

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