The Harvard astrophysicist has devoted years—and thousands of interviews—to the idea that mysterious objects streaking ...

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Researchers propose turning a future NASA moon base into a quarantine station that would screen space samples before they ever reach Earth.

Astronomers may have witnessed one of the rarest and most dramatic cosmic events ever seen: a long-sought intermediate-mass ...

Scientists propose building a lab on the moon to screen Mars and other space samples for alien microbes before they ever ...