A new analysis of the sky has finally confirmed where the missing half of the Universe's visible matter has been hiding.

Astronomers tallying up all the normal matter—stars, galaxies and gas—in the universe today have come up embarrassingly short ...

For decades, scientists have known that ordinary matter — everything made of atoms — accounts for just 15% of the universe’s ...

"We've always known that we need something to complete the puzzle, but we haven't really known what shape or form those ...

Mysterious dark matter makes up 85 percent of matter in the universe, and of the remaining 15 percent, scientists couldn’t ...

This time, astronomers have used new processing techniques to draw out additional details in celebration of the telescope's ...

The collaboration measured the polarization of light from the cosmic microwave background (CMB ... other galaxies, and galaxy clusters. In a sense, it's tracing the evolution of the universe ...

In recent years, one of the most troubling puzzles in astrophysics has grown more urgent. Scientists have realized that the ...

A never-before-seen image of the cosmic microwave background, combining data from the Atacama Cosmology Telescope (ACT) and ...

In the grand puzzle of the cosmos, one question continues to defy easy answers: how fast is the universe expanding?

The Webb Space Telescope has captured a plume of gas and dust streaming from a star in the making, with a spiral galaxy as a stunning backdrop.

Dark matter is hypothesized to outweigh "ordinary matter" in the universe by a factor of five. That means all the stuff we ...