Perbezaan antara semakan "Bolak-balik angkasa lepas Challenger"

 
== Pautan luar ==
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* [http://www.presidency.ucsb.edu/ws/index.php?pid=37646 Ronald Reagan: Address to the Nation on the Explosion of the Space Shuttle Challenger]
* [http://www.spacetoday.org/SpcShtls/ChallengerExplosion1986.html Space Shuttle Challenger Explosion video]