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Thank you Mona. I love the photos and stories.

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On this day in 1846 - September 23rd - Johann Galle at the Berlin Observatory discovered the planet Neptune.

Urbain Le Verrier sent Galle his calculation showing where he thought there should be a new planet. Having received Le Verrier's letter, Galle found the planet that same night.

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On this day in 1783 - September 23rd - Caroline Herschel discovered NGC253.

It looked like no more than a fuzzy patch in Herschel's telescope, but it's now seen as a dusty spiral galaxy in the constellation Sculptor. It's also known as the Sculptor Galaxy or Silver Coin Galaxy.

Last edited by Mona - Astronomy; 09/28/16 04:04 AM.
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On this day in 1644 - September 25th - Danish astronomer Ole Christensen Rømer was born.

He demonstrated that light travels at a finite speed. He did this measuring the length of time between eclipses of Jupiter by one of its moons when the Earth was at different distances from Jupiter.

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On this day in 1814 - September 27th - American astronomer and mathematician Daniel Kirkwood was born.

Kirkwood studied asteroid orbits, and discovered that there were several gaps in the orbits. They're now named Kirkwood gaps and are caused by Jupiter's gravitational effects.

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On this day in 1880 - September 30th - Henry Draper took the first photograph of the Orion Nebula .

It was a breakthrough in astrophotography to capture an image of an object as faint as a nebula. Draper needed fifty minutes of exposure time to get what he did.

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On this day in 1995 - September 30th - the last transmission was received from Pioneer 11. .

Launched on April 6, 1973, Pioneer 11 is one of four spacecraft headed out of the Solar System. It's 96 AU away, a distance 96 times as great as the Earth-Sun distance.

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On this day in 1958 - October 1st - NASA was born .

The launch of Sputnik 1 by the Soviet Union concentrated US minds on not being left behind.

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On this day in 1957 - October 4th - Sputnik was launched by the Soviet Union.

Sputnik 1 was the very first artificial satellite put into orbit.

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On this day in 1923 - October 5th - Edwin Hubble discovered Cepheids in M31, the Andromeda Galaxy.

Cepheid variable stars, based on the work of Henrietta Leavitt, can be used as distance indicators. Hubble used them to show that M31 was too far away to be an object in our own Galaxy.

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