Hubble discovers collection of black holes in globular cluster

Globular cluster NGC 6397 is host to a "concentration of black holes," according to new observations made the Hubble Space Telescope team. Video credit: NASA's Goddard Space Flight Center Paul Morris: Lead Producer Music: "Glass Ships" by Chris Constantinou [PRS] and Paul Frazer [PRS] via Killer Tracks [BMI] and Universal Production Music. Visual Credits: Artist’s Impression of the Black Hole Concentration in NGC 6397 Video credit: ESA/Hubble, N. Bartmann Callout of the Black Hole Concentration in NGC 6397 Video credit: ESA/Hubble, N. Bartmann Artist Rendition of Gaia Spacecraft Image credit: ESA, C. Carreau