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On this day in 2012 – June 13th – NASA's NuStarr X-ray telescope was launched.

NuSTAR (Nuclear Spectroscopic Telescope Array) was the first space-based direct-imaging X-ray telescope operating at energies beyond the Chandra X-ray Observatory.

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On this day in 1963 – June 16th – Valentina Tereshkova in Vostok 6 became the first woman in space.

The Soviet cosmonaut remains the only woman to make a solo space flight.

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On this day in 1714 – June 17th – French astronomer and cartographer César-François Cassini de Thury was born.

He was the grandson of Giovanni Domenico Cassini and the third Cassini to be the director of the Paris Observatory.

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On this day in 1799 – June 18th – English merchant and astronomer William Lassell was born.

He was known for his improvements to the reflecting telescope and his discoveries, e.g., two of the moons of Neptune.

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On this day in 1983 – June 18th – physicist and astronaut Sally Ride became the first American woman in space.

Ride was a crew member of STS-7 Challenger which was launched 2 days after the 20th anniversary of Valentina Tereshkova's space flight.

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On this day in 2009 – June 19th – NASA's Lunar Reconnaissance Orbiter (LRO) and the Lunar Crater Observation and Sensing Satellite (LCROSS) were launched.

The LCROSS mission confirmed the presence of water in a shadowed crater on the Moon. LRO is still mapping the Moon.

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On this day in 1710 – June 21st – Scottish mathematician, optician and telescope maker James Short was born.

Short produced the first nearly distortionless telescope mirrors - they were in demand throughout Europe for several decades. He was also the principal British collator and computer of the worldwide 1761 Venus transit observations.

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On this day in 1675 – June 22nd – the Royal Observatory Greenwich was founded.

The Prime Meridian (0 degrees of longitude) goes through Greenwich.

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On this day in 1894 – June 25th – German physicist and engineer Hermann Oberth was born.

Oberth is considered one of the founding fathers of rocketry and astronautics.

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On this day in 1730 – June 26th – French astronomer Charles Messier was born.

Messier discovered so many comets that King Louis XV called him a "comet ferret". Messier's name is still known for his catalogue of nebulous objects that might be taken for comets.

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