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Thursday, April 24, 2008

Hubble Images Show Violent Mergers


NASA's Hubble Space Telescope has recently provided us with 59 new images showing not the typical placid galactic images, but rather, images of immense galactic violence. Galactic mergers are quite a rare sight, but by looking at distant galaxies, astronomers can see mergers that occurred millions of years ago, when galaxies were much closer together. Since the light from these mergers takes millions of years to reach us, its almost as if we can look "back in time" to view these ancient, violent mergers. Astronomers at NASA can use the Hubble Space Telescope to image these amazingly intricate colliding galaxies.

These images are more than just beautiful views of galaxies, however. These images lend new insights into how the universe was when it was young. They show a much more violent early universe, where galaxies merged much more frequently. It is important to note, however, that these galactic mergers are nothing for us to worry about. These mergers take monumental amounts of time to occur, typically on the order of hundreds of millions of years. Also, the stars in galaxies are so spread out that there is an extremely slim chance of collisions. Our galaxy, in fact, may be the product of past mergers. Galactic mergers can even revitalize old galaxies, giving them a burst of star formation. The image below is a compilation of some of these images.

Clear skies!


Images courtesy of NASA, ESA, A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University), and the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration

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