Monday, 1 February 2016

An Invisible Cloud of Gas is Speeding Towards Us At 700,000 Miles Per Hour

SAXTON/LOCKMAN/NRAO/AUI/NSF/MELLINGER
This visualization of the Smith Cloud shows its size compared to the size of the Earth's moon.

An invisible cloud of gas is speeding toward our Milky Way galaxy at 700,000 miles per hour. But don't worry: It will take about 30 million years to get here.

It's a case of “what goes up must come down," according to Hubble Space Telescope astronomers who say the space cloud likely originated in our galaxy and is boomeranging back. When it returns, they predict "a spectacular burst of star formation, perhaps providing enough gas to make 2 million suns."

Astronomers are aware of many space clouds, but the Smith Cloud is unique because its trajectory is well-known.


“The cloud is an example of how the galaxy is changing with time,” said Andrew Fox of the Space Telescope Science Institute in Baltimore, Maryland. “It’s telling us that the Milky Way is a bubbling, very active place where gas can be thrown out of one part of the disk and then return back down into another.

NASA/ESA/A. FEILD (STSCI)

Doctoral astronomy student Gail Smith discovered the Smith Cloud in the 1960s. Researchers believe it is 11,000 light-years long and 2,500 light-years across.


Fox and his team recently used the Hubble Space Telescope to learn about the cloud's chemical composition and origin.

We only have 30 million years until it plows into the Milky Way.


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