Astrophysicists test a new piece of the sky to probe dark matter and dark energy

In the leading model of cosmology, most of the universe is invisible: a combined 95% is made of dark matter and dark energy.

Most normal matter in the universe isn't found in planets, stars or galaxies: An astronomer explains

If you look across space with a telescope, you'll see countless galaxies, most of which host large central black holes, ...

Women told they have dense breasts don't know what to do next, new study shows

Imagine a 57-year-old woman, let's call her Maria, who's just opened a letter about her mammography results. She's had several mammograms before, but this time reads new information: "Your breasts are ...