January 4, 2016 - Galaxies Swim in the Ghostly Light of Castaway Stars
Galaxies Swim in the Ghostly Light of Castaway Stars An enormous cluster of colliding galaxies four billion light-years away is surrounded by the faint glow of stars that have been torn from their home galaxies in this near-infrared image acquired by the Hubble Space Telescope as part of the Frontier Fields program. The galaxy cluster is called Abell 2744—also known as Pandora’s Cluster—and contains 500 galaxies which together have the equivalent mass of four trillion Suns. Powerful gravitational forces within the cluster are thought to have ripped apart six Milky Way-sized galaxies over the course of six billion years, scattering orphaned stars across intergalactic space. Their dim light is visible to Hubble in near-infrared wavelengths, colored blue in the view above.
Image credit: NASA / ESA / M. Montes (IAC) / J. Lotz / M. Mountain / A. Koekemoer / HFF Team (STScI).
January 4-10, 2016
Holidays - Sky Events - Space History
Quadrantid meteor shower
Mercury appears stationary
Pluto in conjunction with Sun
Venus 6° north of Antares
Venus 3° south of Moon
1998: Lunar Prospector launched
Saturn 3° south of Moon
Jupiter appears stationary
Venus 0.09° north of Saturn
New Moon 8:30 PM ET