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Mark Pennell sits at the helm of his time machine.Mark's Almanac is a 90-second time travel that highlights the world's history from the very serious to the sometimes sublime.

Mark's Almanac for January 28, 2021

A picture of Space Shuttle Challenger on the Crawler Transporter.
NASA
Space shuttle Challenger being carried to the launch pad.

It was on this day in 1986 that the space shuttle Challenger exploded after lift-off. Following the tragedy, President Reagan launched a commission to investigate what went wrong. It was discovered that a faulty O-ring in conjunction with the cold temperatures at launch time lead to the disaster.