NASA’s Hubble space telescope spots ‘galactic traffic jam’
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NASA’s Hubble space telescope has spotted a ‘galactic traffic jam’ more than 60 million light-years away.
Barred spiral galaxy NGC 3887 is located in the southern constellation of Crater (the Cup). The galaxy was discovered in 1785 by astronomer William Herschel.
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A light-year, which measures distance in space, equals about 6 trillion miles.
Barred spiral galaxy NGC 3887. (ESA/Hubble & NASA, P. Erwin et al.)
“The very existence of spiral arms was for a long time a problem for astronomers,” explained NASA, on its website. “The arms emanate from a spinning core and should therefore become wound up ever more tightly, causing them to eventually disappear after a (cosmologically) short amount of time. It was only in the 1960s that astronomers came up with the solution to this winding problem; rather than behaving like rigid structures, spiral arms are in fact areas of greater density in a galaxy’s disk, with dynamics similar to those of a traffic jam.”
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A joint project of NASA and the European Space Agency, the Hubble telescope has captured a host of beautiful images since its launch in 1990. In 2012, NASA released an image of a double nucleus in the Andromeda Galaxy that was captured by the Hubble Space Telescope. A Hubble image released in 2014 showed a double nucleus in spiral galaxy Messier 83.
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