Hubble spots mammoth cloud boomerang back to our galaxy

Hubble spots mammoth cloud boomerang back to our galaxy
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Highlights

NASA\'s Hubble Space Telescope has spotted a monstrous cloud of hydrogen gas that is plummeting toward our galaxy at nearly 1.1 million km per hour. Though hundreds of enormous, high-velocity gas clouds whiz around the outskirts of our galaxy, this so-called \"Smith Cloud\" is unique because its trajectory is well known. 

Washington: NASA's Hubble Space Telescope has spotted a monstrous cloud of hydrogen gas that is plummeting toward our galaxy at nearly 1.1 million km per hour. Though hundreds of enormous, high-velocity gas clouds whiz around the outskirts of our galaxy, this so-called "Smith Cloud" is unique because its trajectory is well known.

New Hubble observations suggest it was launched from the outer regions of the galactic disk, around 70 million years ago. The cloud was discovered in the early 1960s by doctoral astronomy student Gail Smith, who detected the radio waves emitted by its hydrogen.

The cloud is on a return collision course and is expected to plow into the Milky Way's disk in about 30 million years. When it does, astronomers believe it will ignite a spectacular burst of star formation, perhaps providing enough gas to make two million Suns.

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