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Hubble captures photos of galaxies colliding
WASHINGTON. Oct 22: Images of two huge galaxies colliding In a caldron of violence spawning thousands of stars may be a preview of what is in store for tne Earth's own Milky Way in a few billion years, reports AP.
New pictures taken by the Hubble Space Telescope Include the most detailed images ever seen of the churning explosion of energy that occurs when two galaxies —• made up of millions of stars and immense clouds of hydrogen gas and dust — merge Into a single giant galaxy.
Astronomers said Tuesday that such a collision is expected to be the ultimate fate of our own Milky Way galaxy. A nearby galaxy, the Andromeda, Is bearing down on the celestial home of the solar system and the two stellar formations will eventually merge.
Humans need not worry, said Brad Whitmore of the Space Telescope Institute. Even though the Andromeda Is racing toward the Milky Way at 300,000 miles an hour, the collision won't occur for about 5 billion years.
By then, it is expected that the sun will be a burned-out husk and the Earth, if it still exists. will be a lifeless chunk of frozen space rock.
Whitmore said close-up photos of the Antenna galaxy. 63
million light years away, clearly show it was formed by the collision of two spiral Galaxies, such as the Milky fay.
The galaxies include 1,000 to 2,000 clouds of hydrogen gas. each one 60 to 300 light-years across. As the galaxies merge, the clouds lead to the rapid-fire formation of stars that light up like a series of firecrackers, said Francois Schweizer of the Carnegie Institution of Washington.
"The collision crunches the hydrogen gas and new stars form all over the place." said Schweizer.
Also formed are hundreds of gobular clusters, tight stellar rotations each containing thousands of stars.
Whitmore said the photos show in great detail how the globular clusters form, a phenomenon that has long puzzled astronomers. Most globular clusters formed early in the history of the universe and can be seen only faintly by the best of telescopes.
But the Antennae galaxy is close enough to answer some fundamental questions about the clusters.
"By studying this nearby example. we can find what was happening early in the universe." he said.