atmospheric dust

A new study has suggested that a large fragment of the famous Halley’s comet crashed into Earth in 536 AD causing a ripple effect of damage including dramatic changes in the planet’s climate, leading to widespread drought and famine throughout the world, and making humanity more susceptible to “Justinian’s plague”. Evidence comes from the analysis of an ice core pulled out from a layer of ice in Greenland dated between 533 and 540 AD. The core contained huge amounts of atmospheric dust, not all of it originating on Earth. The dust had high levels of tin, which is characteristic of a comet. Since it was deposited in the Northern Hemisphere spring, researchers believe it came from the Eta Aquarid meteor