BALTIMORE THE great 1908 explosion in Siberia, a strange lunar flare- up seen by monks in 1178, and the severe jostling of seismographs left by
astronauts on the moon in 1975 may all have been manifestations of the same phenomenon: a swarm of about 100 cometary fragments that constitute ''a
new feature of the solar system,'' an astrophysicist suggested here today.
Please visit the link provided for the complete story.
Interesting article here. It goes on to say that the earth will pass through this swarm in 2042!