"President John F. Kennedy speaks in the House of Representatives before a joint session of Congress in Washington in this May 25, 1961, file photo. In the background are Vice President Lyndon B. Johnson, left, and House Speaker Sam Rayburn. During the address, Kennedy issued the challenge, ""I believe that this nation should commit itself to achieving the goal, before this decade is out, of landing a man on the Moon and returning him safely to the Earth."" The 40th anniversary of the Apollo 11 launch, which took U.S. astronauts to the moon, is Thursday."
{}