ON THE LOOSE Hypervelocity stars (one illustrated) travel so fast they can escape the galaxy. US 708 is the fastest known of this cohort, possibly ejected by a supernova explosion, astronomers say.
Ruth Bazinet, CfA
Gravity from a galaxy (box) in this Hubble Space Telescope image bends light from a more distant supernova, creating four images of the exploding star (arrows).
NASA, ESA, and T. Treu (UCLA), P. Kelly (UC Berkeley) and the GLASS team; S. Rodney (JHU) and the FrontierSN team; J. Lotz (STScI) and the Frontier Fields Team; M. Postman (STScI), and the CLASH team; and Z. Levay (STScI)
FAR, FAR AWAY With the help of a new instrument, researchers measured distances to 181 galaxies, seen in this Hubble Space Telescope image, including a few that Hubble missed (highlighted).