What really happened at Roswell, N.M., in 1947 ?
In 1997, exactly 50 years after the notorious UFO controversy, the US Air Force issued a report denying any alien crash claims at Roswell, although conspiracy theorists still cry foul.
And that significant event is just one standout in a busy week in science history, which also includes a landmark milestone in spaceflight history, the discovery of a new element, a thrilling achievement in space tourism, and the death of a very, very old friend of Charles Darwin.
Check out the slideshow for all the biggest events in science history this week.
This Week In Science History, June 18-24
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