jueves, 8 de agosto de 2013

Hubble Space Telescope solves a 40-year mystery

What is the origin of the Magellanic Stream, a long ribbon of gas stretching nearly halfway around our Milky Way galaxy? Now we know.


These companion images show wide and close-up views of a long ribbon of gas called the Magellanic Stream, which stretches nearly halfway around our Milky Way galaxy.


Astronomers using NASA’s Hubble Space Telescope have solved a 40-year mystery on the origin of the Magellanic Stream, a long ribbon of gas stretching nearly halfway around our Milky Way galaxy. The Large and Small Magellanic Clouds, two dwarf galaxies orbiting the Milky Way, are at the head of the gaseous stream.



 Since the stream’s discovery by radio telescopes in the early 1970s, astronomers have wondered whether the gas comes from one or both of the satellite galaxies. Now, new Hubble observations reveal that most of the gas was stripped from the Small Magellanic Cloud about 2 billion years ago, and a second region of the stream originated more recently from the Large Magellanic Cloud.

source and credit a earthsky