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Have you ever wondered what it would be like to see something 70 miles wide moving over the landscape at almost 1,700 miles per hour?
I think it was a Carl Sagan essay where I first heard the experience described. He had that very experience standing on a hilltop with hundreds of other people. All expected the experience and understood what was happening. But when a shadow stretching from horizon to horizon appeared and swept over the valleys and grasslands and swallowed the assembled people, some involuntarily screamed. [Read more...]