Through a combination of satellite imagery and geological samples collected on Earth, some scientists now believe that they have evidence that large asteroid and comet impacts are much more common than previously thought. One such impact may have occurred 4,800 years ago in the Indian Ocean, leaving a crater 18 miles in diameter.
Dr. Bruce Masse, of the Los Alamos National Laboratory, has been collecting an analyzing 175 flood myths from around the world. There is speculation that that impact 4,800 years ago could have caused a large tsunami and worldwide weather change, including torrential rains, that are described in the myths. 14 of the myths mention a full solar eclipse which Dr. Masse speculates could be used to date the impact to May, 2807 BC.