What is dark matter? For decades, firm astronomical evidence from observations of stars and galaxies has indicated that most of the matter in the universe cannot be seen directly with telescopes. Instead, this matter must be observed indirectly through its gravitational pull on the objects that we can see. This is how the term “dark matter” was coined. But how do we search for something we can’t see? Explore these questions with UC Berkeley astrophysicist Matt Pyle.
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