Hubble captures galaxy NGC 3156

This dream-like image from the NASA/ESA Hubble Space Telescope features the galaxy known as NGC 3156. It lies about 73 million light-years from Earth, in the minor equatorial constellation Sextans.

Measuring dark matter halos around ancient quasars

At the center of every galaxy is a supermassive black hole. Beyond a certain size, these become active, emitting huge amounts of radiation, and are then called quasars. It is thought these are activated by the presence of ...

page 19 from 40