On this day: February 7

Published On: Feb 06 2013 06:01:03 PM CST   Updated On: Feb 07 2014 01:00:00 AM CST

The Mississippi River is rocked by earthquakes, Baltimore burns, Chaplin debuts "The Tramp," The Beatles arrive in America, and space shuttle astronauts make the first untethered spacewalk, all on this day.

OTD February 7 - untethered spacewalk
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NASA

1984: Space shuttle Challenger astronauts Bruce McCandless II and Robert L. Stewart make the first untethered space walk using the Manned Maneuvering Unit, a propulsion unit strapped to their backs.

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