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On this day in 1873 - October 9th - Kepler's Supernova was first observed.

It occurred about 20,000 light years away in the constellation Ophiuchus. It was so bright that at its peak it was visible during the day for over three weeks.


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On this day in 1846 - October 10th - English businessman and astronomer William Lassell discovered Triton, Neptune's largest moon.

Lassell discovered the moon just 17 days after German astronomer Johann Galle discovered Neptune, using Urbain LeVerrier's calculations.


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On this day in 1980 - October 10th - the Very Large Array (VLA) was dedicated.

Now known as the Karl G. Janksy Array, it's an important radio telescope facility in New Mexico. Jansky was a pioneer of radio astronomy.


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On this day in 1758 - October 11th - German physician and astronomer Heinrich Olbers was born.

Olbers is best remembered for his discovery of the asteroids Pallas and Vesta.


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On this day in 1964 - October 12th - the Soviet craft Voskhod 1 was launched.

As the first spacecraft to carry three cosmonauts, it was another step forward in manned space flight.


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On this day in 1884 - October 13th - Greenwich in the United Kingdom was adopted as the prime meridian of the world.

There had been many prime meridians in use by countries around the world. But at the International Meridian Conference held in Washington DC, 25 maritime countries voted to adopt the Greenwich meridian as the longitude line of zero degrees.



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On this day in 1993 - October 13th - the British Interplanetary Society was founded in Liverpool, UK by Phillip Cleator.

The society is the oldest space advocacy organisation in the world.


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On this day in 1994 - October 13th - NASA's Magellan mission ended with the spacecraft plunging into Venus.

Magellan - also referred to as the Venus Radar Mapper - was the first interplanetary mission to be launched from the Space Shuttle. It mapped the surface of Venus and measured the planetary gravitational field.


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On this day in 1788 - October 14th - Irish geophysicist, explorer and astronomer Edward Sabine was born in Dublin.

He's best remembered by astronomers for his research into changes in the Earth’s magnetic field, which he eventually recognised as being associated with solar activity. Using pendulum experiments, Sabine also made the most accurate determination of the exact shape of the Earth up to that time.


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On this day in 1829 - October 15th - American astronomer Asaph Hall was born.

Hall is best known for his discovery of Phobos and Deimos, the moons of Mars.


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