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On this day in 1877 – September 11th – English astrophysicist and mathematician James Jeans was born in Ormskirk, Lancashire.
Jeans made major contributions to the early understanding of stellar radiation and stellar evolution.
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On this day in 1985 – September 11th – the International Cometary Explorer (ICE) became the first spacecraft to make a flyby of a comet.
It passed through the plasma tail of comet Giacobini-Zinner within about 7,800 km (4,800 mi) of the nucleus.
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On this day in 1997 – September 11th – NASA's Mars Global Surveyor arrived at Mars.
It is a global mapping mission, carrying a suite of science instruments designed to study the entire Martian surface, atmosphere and interior.
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On this day in 1959 – September 12th – the Soviet spacecraft Luna 2 was launched to the Moon.
The following day, Luna 2 became the first human object to land on another celestial body.
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On this day in 1970 – September 12th – the Soviet spacecraft Luna 16 was launched to the Moon.
It was the first robotic probe to land on the Moon and return a sample of lunar soil to Earth.
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On this day in 1915 – September 14th – John Lowry Dobson was born in Beijing, China.
The American amateur astronomer, who grew up in the San Francisco area, was a popularizer of astronomy. He's best known for having designed and promoted a quality telescope that could be made using inexpensive, readily available materials. The Dobsonian telescope meant that amateur astronomers could afford a portable instrument of a size and aperture that would otherwise be beyond their means.
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. On this day in 1938 – September 15th – American astronomer James Christy was born in Milwaukee, Wisconsin.Christy is best known for his discovery of Charon, the first known moon of Pluto and the largest of its five known natural satellites..
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On this day in 1968 – September 15th – the Soviet spacecraft Zond 5 was launched.
It was the first spacecraft to travel to the Moon with living creatures on board. It circled the Moon and returned safely to Earth with its passengers, including two tortoises.
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. On this day in 2017 – September 15th – the NASA/ESA Cassini mission ended with planned entry into Saturn's atmosphere.The Cassini spacecraft had spent over 13 years studying Saturn and its moons and rings..
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. On this day in 1848– September 16th – Saturn's moon Hyperion was discovered.American astronomers William and George Bond, and English astronomer William Lassell independently discovered the moon..
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