The Geminids are a meteor shower that happens every December. NASA says astronomers consider it one of the "best and most reliable" showers of the year, but the shower actually did not start occurring until very recently (in astronomical and human terms).
Astronomers are puzzled about the number of meteors observed. While scientists have known for a generation about the source of the shower – an asteroid named 3200 Phaethon – the volume of the shower's meteors is strange given the observed amount of debris.
Geminid Meteor Shower: Dust From an Asteroid (space.com)
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