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  Successfully launched and entered Earth's orbit.
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  The first U.S. satelite to orbit and discovers the Earth's radiation belt.
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  Alan Shepard Jr. in launched into space on a 15- minute, 22-second suborbital flight.
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  First American to orbit Earth, completing 3 orbits.
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  Neil Armstrong and Edwin "Buzz" ,Aldrin of Apollo XI , spend 21 1/2 hours on the moon, 2 1/2 of those outside the capsule.
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  Longest and last stay of man on the moon. Lasts 74 hours, 59 munutes.
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  Who Was Sally Ride? Sally Ride becomes first American woman in Space.
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  Challenger shuttle explodes 73 seconds after launch, killing its crew of seven.
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  Shannon Lucid sets a U.S space endurance record and a world record for woman.
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  Glenn returned to space aboard shuttle Discovery.
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  16 minutes before landing, shuttle Columbia breaks apart over Texas.
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  Atlantis arrives at Kennedy Space Center.
