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.
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.