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Cosmic Collisions Galore!
Astronomy textbooks typically present galaxies as staid, solitary, and majestic island worlds of glittering stars.
But galaxies have a dynamical side. They have close encounters that sometimes end in grand mergers and overflowing sites of new star birth as the colliding galaxies morph into wondrous new shapes.
Today, in celebration of the Hubble Space Telescope's 18th launch anniversary, 59 views of colliding galaxies constitute the largest collection of Hubble images ever released to the public. This new Hubble atlas dramatically illustrates how galaxy collisions produce a remarkable variety of intricate structures in never-before-seen detail.
Astronomers estimate that only one out of one thousand galaxies in the nearby universe in the act of colliding. However, galaxy mergers were much more common long ago when they were closer together, because the expanding universe was smaller. Astronomers study how gravity choreographs their motions in the game of celestial bumper cars and try to observe them in action.
For all their violence, galactic smash-ups take place at a glacial rate by human standards - timescales on the order of several hundred million years. The images in the Hubble atlas capture snapshots of the various merging galaxies at various stages in their collision.
Most of the 59 new Hubble images are part of a large investigation of luminous and ultra- luminous infrared galaxies called the GOALS project (Great Observatories All-sky LIRG Survey). This survey combines observations from Hubble, NASA's Spitzer Space Telescope, NASA's Chandra X-ray Observatory, and NASA's Galaxy Evolution Explorer. The majority of the Hubble observations are led by Aaron S. Evans of the University of Virginia, Charlottesville, the National Radio Astronomy Observatory, and Stony Brook University.
About the Data
- InstrumentInstrumentThe science instrument used to produce the data.HST>ACS/WFC and HST>WFPC2
- Object NameObject NameA name or catalog number that astronomers use to identify an astronomical object.[Top row, left to right] Arp 148, UGC 9618, Arp 256, NGC 6670 [Middle row, left to right] NGC 6240, ESO 593-8, NGC 454, UGC 8335 [Bottom row, left to right] NGC 6786, NGC 17, ESO 77-14, NGC 6050
- Object DescriptionObject DescriptionThe type of astronomical object.Interacting Galaxies
- Release DateApril 24, 2008
- Science ReleaseCosmic Collisions Galore!
- Credit
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Details
Claire Andreoli
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
claire.andreoli@nasa.gov
