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

Almost 20 years to the day after Valentina Tereshkova's historic flight, Sally Ride was part of the crew of STS-7 Challenger.


Mona Evans
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On this day in 1799 – June 18 – William Lassell was born.

Lassell was a prominent English astronomer. The best known of his discoveries was Triton, Neptune's largest moon. He found it seventeen days after the planet itself was discovered at the Berlin Observatory.

Last edited by Mona - Astronomy; 06/19/16 01:00 AM.

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On this day in 1675 – June 22 – the Royal Observatory Greenwich was established by a royal warrant from Charles II.

The Royal Observatory Greenwich is best known as the place where time begins because the prime meridian of longitude goes through it.

Last edited by Mona - Astronomy; 06/26/16 06:30 AM.

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On this day in 1894 – June 25 – Hermann Oberth was born.

Oberth was an Austro-Hungarian-born German physicist and engineer. He is considered one of the founding fathers of rocketry and astronautics.


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

Messier, a French astronomer, is best known for his catalog of nebulae and star clusters. It helped comet hunters distinguish a comet from these permanent objects.


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On this day in 1868 – June 29 – George Ellery Hale was born.

Hale was an American solar astronomer. But he's best known for - three times in his life - being instrumental in the creation of what was, in its time, the world's largest telescope. They were: (1) the 40-inch refractor at Yerkes Observatory, (2) the 100-inch reflector at Mt Wilson Observatory, and (3) the 200-inch reflector at Palomar Observatory.


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On this day in 1908 – June 30 – the Tunguska event occurred.

Over 2000 sq km (800 sq mi) of Siberian forest was leveled. The most likely cause was a large asteroid or comet that streaked in as a fireball and exploded.

In 2015 Asteroid Day was established as an annual event to increase awareness of the dangers and promote action to track asteroids and devise ways of deflecting them.


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On this day in 1935 – July 3 – Harrison Schmidt was born.

Schmidt was the geologist who went to the Moon on the Apollo 17 mission. He was the only professional scientist ever to go beyond low Earth orbit.


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On this day in 1868 – July 4 – Henrietta Leavitt was born.

Henrietta Swan Leavitt discovered the relationship between the period and luminosity of Cepheid variable stars that allows them to be used to calculate distances in deep space.

Last edited by Mona - Astronomy; 07/05/16 07:48 AM.

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On this day in 1687 – July 6th – Isaac Newton's Principia was published.

The set of three books includes Newton's laws of motion which form the foundation of classical mechanics, and his law of universal gravitation. The Principia is regarded as one of the most important works in the history of science.

Last edited by Mona - Astronomy; 07/06/16 12:04 PM.

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