Galaxies stash mass in clouds of gas

Galactic haloes may have 10 to 100 times as much matter as previously thought

By Stephen Ornes, 09:38 AM January 28, 2014

For more than a decade, astronomers have been grappling with a mystery: Where do galaxies keep most of their visible matter? This is the weighty material we can see and that takes up space. Scientists have predicted there should be more of this matter than astronomers have seen. But where? At a science conference in January, astronomers offered a possible answer. This missing mass may be hiding in surrounding clouds of gas.

Matter is the stuff in the universe. Astronomers say most of the matte...

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