It’s often said that nonastronomers recognize three celestial objects: the Moon, the rings of Saturn, and Halley’s Comet. History’s first identified periodic comet, 1P/Halley, returned to the night sky in 1986 for its most-observed appearance on record. And that’s saying something, because it’s been observed at least as far back as 240 B.C.E. Unfortunately, duringContinue reading “March 8, 1986: The second of five probes flies by Halley’s Comet”
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