76 years · All Facts

76 years
Halley's Comet returns on average every 76 years; last seen in 1986, next perihelion is in 2061.
SrcNASA Science — 1P/Halley

Next evidence →1 trillion kilogramsA sugar-cube of neutron-star material would weigh about 1 trillion kilograms on Earth — extreme density after stellar collapse.

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