All observations in astronomy are based on light (electromagnetic radiation) emitted from stars and galaxies and, according to the general theory of relativity, the light will be affected by gravity.

(Phys.org) —By observing a high-speed component of a massive galaxy cluster, Caltech/JPL scientists and collaborators have detected for the first time in an individual object the kinetic ...

The Dark Energy Camera has captured an image of the dazzling Coma Cluster, named after the hair of Queen Berenice II of Egypt. Not only significant in Greek mythology, this collection of galaxies was ...

New Hubble Space Telescope observations tell us we could be wrong about how globular clusters of stars form in the cosmos. Although globular clusters in another galaxy show a similarity to those in ...

Learn how radio observations uncovered unusually hot gas inside a young galaxy cluster, revealing how black holes and star formation may heat clusters far earlier than expected. Astronomers studying ...