Assertion: dark matter | /r/HasProperty | theorized
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Source sentences:
text: Dark matter, an as-yet-undetected form of matter that scientists believe makes up more than a quarter of the mass and energy of the universe, was first theorized when scientists noticed that stars at the outer edges of galaxies and galaxy clusters were moving much faster than Newton’s theory of gravity said they should.
text: Dark Matter is a theorized form of matter thought to make up 85% of the matter in the universe.