This is a Hubble Space Telescope mosaic of a portion of the immense Coma cluster of over 1,000 galaxies, located 300 million light-years from Earth. Hubble’s incredible sharpness was used to do a comprehensive census of the cluster’s most diminutive members: a whopping 22,426 globular star clusters. Among the earliest homesteaders of the universe, globular star clusters are snow-globe-shaped islands of several hundred thousand ancient stars. The survey found the globular clusters scattered in the space between the galaxies. They have been orphaned from their home galaxies through galaxy tidal interactions within the bustling cluster. Astronomers will use the globular cluster field for mapping the distribution of matter and dark matter in the Coma galaxy cluster.
Credit: NASA, ESA, J...

This is a composite view of recording sites used for identifying neural correlates of mood state in the epilepsy monitoring unit patients; a subset of these were also used in the stimulation studies.
Credit: Ben Speidel, Chang Lab, UCSF

Chang-Beom Eom, right, and Mark Rzchowski inspect a materials growth chamber. The researchers have made a new material that can be switched from electrical conductor to insulator. Credit: UW-Madison photo by Sam Million-Weaver

This map of the entire sky shows the location of 739 blazars used in the Fermi Gamma-ray Space Telescope’s measurement of the extragalactic background light (EBL). The background shows the sky as it appears in gamma rays with energies above 10 billion electron volts, constructed from nine years of observations by Fermi’s Large Area Telescope. The plane of our Milky Way galaxy runs along the middle of the plot.
Credit: NASA/DOE/Fermi LAT Collaboration