METEORS FROM HALLEY’S COMET: Earth is entering a stream of debris from Halley’s Comet, source of the annual Orionid meteor shower. Last night, NASA’s network of all-sky meteor cameras detected 23 Orionid fireballs over the USA–a result of comet dust hitting the atmosphere at speeds exceeding 65 km/s (145,000 mph). Forecasters expect the shower to peak on Oct. 21-22 with as many as 25 meteors per hour. Visit Spaceweather.com for observing tips and sky maps.
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Above: An Orionid fireball streaks over the Allegheny Observatory in Pittsburgh on Oct. 20, 2017. Photo credit: NASA’s All-Sky Fireball Network. More images may be found in the Realtime Meteor Photo Gallery.