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On this day in 1965 - February 20th - John Glenn became the first American to orbit the Earth.

Glenn's space capsule Friendship 7 took him around the Earth three times before its splashdown.


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On this day in 1965 - February 20th - NASA's Ranger 8 ended its mission by a crash landing on the Moon.

Ranger 8 was the first NASA spacecraft to take high resolution close-up images of the Moon's surface. It transmitted over 7000 images, intended to help choose landing sites for Apollo missions, before its own mission ended.


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On this day in 1744 - February 21st - Dutch astronomer Eise Eisinga was born.

He built the Koninklijk Eise Eisinga Planetarium at his house in Franeker, Netherlands. The orrery still exists and is the oldest functioning planetarium in the world.


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On this day in 1978 - February 22nd - the first Navstar GPS satellite was launched.

What is now called the Global Positioning System (GPS) was originally called Navstar GPS.


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On this day in 1945 - February 23rd - Ukranian astronomer Svetlana Gerasimenko was born.

Gerasimenko's name is well known because she was the co-discoverer of comet 67P/Churyumov-Gerasimenko. This was the comet explored by the Rosetta mission. Both the Rosetta spacecraft and the lander Philae are on the comet as it continues to orbit the Sun.


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On this day in 1990 - February 23rd - Pioneer 11 crossed the orbit of Neptune on its way out of the Solar System.

Although on that date the spacecraft went beyond the most distant planet, since there are dwarf planets and many other objects beyond Neptune, the spacecraft still hasn't left the Solar System. It's now over 100 times farther from the Sun than the Earth is.


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On this day in 1987 - February 23rd - the light from supernova SN 1987A reached Earth.

The supernova occurred in the Tarantula Nebula in our neighboring galaxy the Large Magellanic Cloud. It was the closest supernova seen in nearly four hundred years, visible to the unaided eye in the southern hemisphere. It has greatly increased our understanding of this spectacular phenomenon.


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On this day in 1968 - February 24th - the discovery of the first pulsar was announced.

A pulsar is a fast-rotating neutron star that emits a beam of electromagnetic radiation. We can only detect it when it's pointing towards us, rather like a lighthouse, so it seems to pulse. A neutron star is the remnant of a massive star following the collapse of its core in a supernova explosion.


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On this day in 1842 - February 26th - Camille Flammarion, French astronomer and popular author, was born.


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On this day in 1897 - February 27th - French astronomer Bernard Lyot was born.

Bernard Lyot's work brought him major international awards. His most important contributions to astronomy were in solar observing, especially the invention of the coronagraph which makes it possible to observe the Sun's corona without waiting for a total eclipse.


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