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What are black holes?

How did we discover black holes? How are black holes created? What are black holes made of? What do black holes look like? Click to find out.

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Download this free eight-page PDF download for four short stories on black holes. Learn more about when we first observed gravitational waves, the Event Horizon Telescope and how it assists in the explanation of the universe’s most mysterious objects, and how the collision of two black holes led to the rewriting of stellar evolution.

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Click here to download a FREE astrophotography PDF curated by Astronomy magazine.

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