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News Release Archive:

News Release 118 of 959

May 31, 2012 01:00 PM (EDT)

News Release Number: STScI-2012-20

NASA's Hubble Shows Milky Way is Destined for Head-on Collision with Andromeda Galaxy

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Video: The Fate of the Milky Way, Andromeda, and Triangulum Galaxies (Annotated)

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The three largest galaxies in our Local Group of Galaxies are our Milky Way along with the Andromeda (also known as Messier 31) and Triangulum (also known as Messier 33) galaxies. This scientific visualization of a computer simulation depicts their joint evolution over the next several billion years and features the inevitable massive collision between the Milky Way and Andromeda. Hubble Space Telescope observations indicate that the two galaxies, pulled together by their mutual gravity, will crash together in a head-on collision about 4 billion years from now. The thin disk shapes of these spiral galaxies are strongly distorted and irrevocably transformed by the encounter. Around 6 billion years from now, the two galaxies will merge to form a single elliptical galaxy. The Triangulum galaxy continues to orbit the merged pair through the end of this computer simulation, though other computer models show it becoming part of the collision.

The visualization covers 8.2 billion years into the future at 105 million years per second. Colors are representative: light blue for spiral galaxies (considered "blue" in astronomy parlance because of their active star formation) and orange-yellow for elliptical galaxies (called "red" by astronomers for their old stellar populations). A random background field of galaxies has been added to the simulation in order to indicate the camera motion through the simulation volume.

Visualization Credit: NASA, ESA, and F. Summers (STScI)

Simulation Credit: NASA, ESA, G. Besla (Columbia University), and R. van der Marel (STScI)

Selected still images from this video (click to enlarge):


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