Cernan's space­walk was troubled from the start. His visor fogged, he sweated profusely and struggled with his tasks, and he had problems moving in microgravity

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Albert Michelson, winner of the 1907 Nobel Prize in Physics for his work on finding the 💫 speed of light. He received 1st Nobel Prize awarded to an American scientist @facethenation

Albert Michelson made use of a special eight-sided revolving mirror and obtained a value of 299,798 km/sec for the velocity of light

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Apollo 7 was the first manned flight of the Apollo Program, and was the first mission to use TV cameras from space, October 14, 1968 @facethenation

Walter Schirra and Donn Eisele are seen in the first live television transmission from space. Schirra is holding a sign which reads, "Keep those cards and letters coming in, folks!"

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During World War II, Franklin Roosevelt and Winston Churchill met in 1941 aboard the battleship Prince of Wales to sign the Atlantic Charter that set out a vision for the postwar world @facethenation

Winston Churchill walking the deck of the battleship Prince of Wales during the Atlantic Charter Conference, August 11, 1941

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Russell Schweickart takes pics during an extravehicular activity spacewalk, March 1969 @facethenation

Russell Schweickart performs a spacewalk to test the new spacesuit and backpack designed for moonwalking astronauts

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Roald Amundsen was the first people to reach the South Pole on 1911 @facethenation

Amundsen started his journey on Oct 19, 1911, setting off with five men, four sledges and 52 dogs. They reached their final destination on Dec 14 - the first humans at the South Pole

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Gemini 8 was launched on March 16, 1966, and Neil Armstrong performed the first successful docking of two vehicles in space @facethenation

Neil Armstrong getting suited up for his Gemini 8 mission

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At the end of the last Apollo 15 moon walk, David Scott held out a geological hammer and a feather and dropped them at the same time @facethenation

Because of the negligible lunar atmosphere, there was no drag on the feather, which hit the ground at the same time as the hammer

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In 1945,18-year-old Princess Elizabeth joined the Auxiliary Territorial Service. She was the only female member of the royal family ever to serve in the armed forces @facethenation

Princess Elizabeth (later Queen Elizabeth II) of Great Britain doing technical repair work during her World War II military service

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Alan Bean was the fourth man to walk on the Moon 👨‍🚀🌔

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American flag on the Moon surface with Apollo 12 astronaut Alan Bean's shadow in November 19, 1969 @facethenation

Thomas Edison exhibits a replica of his first successful incandescent lamp @facethenation