The Hunt for Monster Black Holes

The Hunt for Monster Black Holes

It's a basic scary-movie rule: Never show the big, bad monster. Show his shadow, his tooth marks, his trail of slime. But as soon as you show his face, the fright bubble pops.

The universe seems to understand this rule. Its biggest, baddest monsters—supermassive black holes that haunt the center of nearly every galaxy, containing as much mass as millions or billions of stars—are totally invisible.

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