News tagged with cluster galaxies

Measuring galaxy evolution with globular clusters

Globular clusters are gravitationally bound ensembles of stars, as many as a million stars in some cases, grouped in roughly spherical clusters with diameters as small as only tens of light-years. Globular ...

Mar 23, 2015
4.3 / 5 (6) 0

Cosmic bumps on cosmic ripples

In 1969, the astrophysicists Rashid Sunyaev and Yakov Zel'dovich realized that the then recently discovered cosmic microwave background radiation (CMBR) would be distorted by hot cosmic gas. Hot electrons ...

Mar 13, 2015
4.6 / 5 (12) 1

Dark matter is darker than once thought

This panel of images represents a study of 72 colliding galaxy clusters conducted by a team of astronomers using NASA's Chandra X-ray Observatory and Hubble Space Telescope. The research sets new limits on ...

Mar 27, 2015
3.6 / 5 (9) 8