the count- less meteors and meteorites that regularly bombard the earth.
The authors estimate that the meteor was roughly 6.2 miles in diam- eter and created roughly 1,000 times more atmospheric dust than the Indonesian volcano Krakatoa, which spewed about 11 cubic miles of material into the air in 1883. Krakatoa caused brilliant sunsets worldwide for two years; the meteor may have turned day into night for several years.
The fossil record supports theories of a killing global dust cover. Microscopic...