17 January 2018
First inactive stellar-mass black hole found in a globular cluster
... the mass of the Sun. This is the first detection of an inactive black hole found in a globular cluster, that has such a very low mass. Globular star clusters are among the oldest known stellar systems in the Universe and as the name...
08 March 2019
Astronomers weigh the galaxy with Hubble and Gaia
... galaxy; the rest we still can’t see, just infer. "Because of their great distances, globular star clusters are some of the best tracers astronomers have to measure the mass of the vast envelope of dark matter ...
29 March 2018
A see-through galaxy questions the need for dark matter
...larger than the Milky Way, but contains about 250 times fewer stars. By looking at the dynamical properties of ten globular clusters – essentially, a very large ball of stars – orbiting the galaxy, it allowed the team to work out an independent value...
