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On this day in 1995 – December 2nd – the Solar and Heliospheric Observatory of NASA and ESA was launched.

It was originally planned as a two-year mission, but it's still providing essential data about the Sun and space weather.


Mona Evans
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Yes, you are right, Mona. Our debris is light and would disintegrate on re-entry. We are bombarded all the time.

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On this day in 1639 – December 6th – Jeremiah Horrocks and William Crabtree became the first people ever to observe a transit of Venus.

In the north of England in the early 17th century, there was an amazing circle of astronomers. They were well ahead of their time and included the first two people ever to observe a transit of Venus. What ended this brief flowering?

The Transit of Venus - Book Review

Last edited by Mona - Astronomy; 12/07/16 03:52 AM.

Mona Evans
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On this day in 1676 – December 7th – the first news was published of Danish astronomer Ole Rømer's measurement of the speed of light.

Rømer's work was based on observations of the eclipses of the moons of Jupiter. At that time not everyone was convinced that light even had a finite speed.

Google has celebrated the 340th anniversary of the publication of Rømer's work with a doodle.


Mona Evans
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On this day in 1905 – December 7th – Gerard Kuiper was born.

The Dutch-American astronomer is considered by many to be the father of modern planetary science.


Mona Evans
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On this day in 2010 – December 8th – Dragon 1 was launched.

The spacecraft, launched by SpaceX, was the first commercial spacecraft recovered from orbit.


Mona Evans
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On this day in 1863 – December 11th – Annie Jump Cannon was born.

The American astronomer classified nearly a quarter of a million stellar spectra for the Henry Draper catalog, and oversaw its publication after the death of observatory director Edward Pickering.

Annie Jump Cannon

Last edited by Mona - Astronomy; 12/11/16 07:14 AM.

Mona Evans
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On this day in 1546 – December 14th – Tycho Brahe was born.

The Danish astronomer was the greatest ever observer in the days before the telescope. His extensive collection of accurate observations made it possible for Kepler to work out the orbits of the planets.

Tycho Brahe


Mona Evans
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On this day in 1972 – December 14th – Apollo 17 astronaut Gene Cernan was the last person to walk on the Moon.


Mona Evans
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On this day in 2013 – December 14th – the Chinese lander Chang'e-3 landed on the Moon.

After the landing the rover Yutu (Jade Rabbit) was deployed.


Mona Evans
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