Hubble's new image of galaxy cluster Abell 209 reveals over 100 galaxies and gravitational lensing effects from dark matter ...

A massive, spacetime-warping cluster of galaxies is the setting of today’s NASA/ESA Hubble Space Telescope image. The galaxy cluster in question is Abell 209, located 2.8 billion light-years away in ...

The universe is a strange place: only 5% of the mass of everything that exists is ordinary matter. The rest is 25% dark ...

Physicists in Switzerland are turning to a new method in the search for nature’s possible fifth force—one that might explain ...