Reports of strange lights in the sky. What appear to be craft flying through the air following impossible trajectories. Radar and camera signatures of mysterious origins. Whatever you want to call them—Unidentified Flying Objects (UFOs) or Unidentified Anomalous Phenomena (UAPs)—they are certainly weird. I get it; many of the questions we have about these bizarre occurrences do not have a satisfying answer.

But this is exactly why, as a scientist, I won’t say they’re aliens.

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