Invisible Structures Size of the Earth’s Orbit Lurk in Milky Way’s ‘Atmosphere’

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Astronomers got the first hints of mysterious objects 30 years ago when they saw radio waves from a bright, distant galaxy called a quasar varying wildly in strength. They figured out this behavior was the work of our Galaxy’s invisible…

from The Daily Galaxy –Great Discoveries Channel: Sci, Space, Tech http://ift.tt/1OCajDr
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I'm presently a student of life who is trying to figure out the mysteries of the universe. Any hints anybody?

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