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On this day in 1976 - July 20th - NASA's Viking 1 became the first spacecraft to land successfully on Mars and perform its mission.

Part of its mission was a biology experiment whose purpose was to look for evidence of life.






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On this day in 1969 - July 20th - Apollo 11 astronauts became the first humans to set foot on another world.

Neil Armstrong, followed by Buzz Aldrin, stepped out of their lander and walked on the Moon, taking photographs and setting up experiments.



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On this day in 1620 - July 21st - French astronomer Jean Picard was born.

Picard collaborated and corresponded with many fellow scientists, including Isaac Newton, Christiaan Huygens, Ole Rømer, and Giovanni Cassini, amongst others. He was a founding member of the French Academy of Sciences.



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On this day in 1784 - July 22nd - German astronomer and mathematician Friedrich Bessel was born.

Bessel was the first astronomer who determined reliable values for the distance from the sun to another star by the method of parallax.

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On this day in 1999 - July 23rd - NASA's Chandra X-ray Observatory was deployed by STS-93 Columbia.

Columbia was under the command of Eileen Collins, the first woman commander of s space shuttle mission.

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On this day in 1928 - July 23rd - American astronomer Vera Rubin was born.

Rubin's pioneering work on galaxy rotation rates uncovered a discrepancy between the predictions and the observations. This was early evidence of the existence of dark matter.



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On this day in 1972 - July 23rd - Landsat 1 was launched.

The near-polar orbiting spacecraft served as a stabilized, Earth-oriented platform for obtaining information on Earth resources of all kinds, meteorology, pollution, etc. Over the lifetime of the satellite it provided around 300,000 images.

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On this day in 1950 - July 24th - the first rocket was launched from Cape Canaveral, Florida.

Cape Canaveral - which for a time was called Cape Kennedy - became the launch site for the manned space program. Today the USA can only put astronauts into space via Russian launches.

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On this day in 2009 - July 24th - the Gran Telescopio Canarias (GranTeCan or GTC) was dedicated.

Located on La Palma in the Canary Islands of Spain, it's the world's largest single-aperture optical telescope.



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On this day in 1969 - July 24th - the crew of Apollo 11 returned safely to Earth.

President John F. Kennedy's goal "of landing a man on the moon and returning him safely to the earth" had been achieved "before this decade is out", though he didn't live to see it.



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