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5 December 2013 11:26 am ,
Vol. 342 ,
An animal rights group known as the Nonhuman Rights Project filed lawsuits in three New York courts this week in an...
Researchers have been hot on the trail of the elusive Denisovans, a type of ancient human known only by their DNA and...
Thousands of scientists in the Russian Academy of Sciences (RAS) are about to lose their jobs as a result of the...
Dyslexia, a learning disability that hinders reading, hasn't been associated with deficits in vision, hearing, or...
Exotic, elusive, and dangerous, snakes have fascinated humankind for millennia. They can be hard to find, yet their...
Researchers have sequenced and analyzed the first two snake genomes, which represent two evolutionary extremes. The...
Snake venoms are remarkably complex mixtures that can stun or kill prey within minutes. But more and more researchers...
At age 30, Dutch biologist Freek Vonk has built up a respectable career as a snake scientist. But in his home country,...
- 5 December 2013 11:26 am , Vol. 342 , #6163
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ScienceShot: Hydrogen 'Bridge' Connects Two Galaxies
12 June 2012 1:37 pm
ANCHORAGE, ALASKA—Two large neighbors of our own Milky Way galaxy—Andromeda (upper right) and Triangulum (lower left)—experienced a close encounter in the distant past. When they brushed past each other billions of years ago, cold hydrogen gas was pulled out of the galaxies by their mutual gravity. The faint radio emission of the resulting hydrogen "bridge," the red material stretching from Andromeda in the direction of Triangulum, was first hypothesized based on observations from a Dutch radio telescope in 2004 and has now been mapped in detail by the Green Bank Telescope in West Virginia. The bridge, described here yesterday at the 220th meeting of the American Astronomical Society, extends over hundreds of thousands of light-years, and the hydrogen gas appears to be clumped into clouds a few thousand light-years across. Next time, the two galaxies may not be so lucky. Recent Hubble Space Telescope observations have revealed that Andromeda will collide and merge with our Milky Way in a few billion years. By then, the smaller Triangulum galaxy may have already collided with either of its two larger neighbors. Ultimately, the trio will meld into one giant elliptical galaxy, flinging stars and planets in all possible directions.
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