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On this day in 2005 - January 5th - UB313 (Eris) was discovered.

The discovery of a body possibly bigger than Pluto set off a debate that ended up with both Pluto and Eris categorized as dwarf planets.

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On this day in 1892 - January 5th - the first successful photograph was taken of an aurora.

Early cameras couldn't catch the dim light of an aurora and long exposures don't work on something that moves. German physicist Martin Brendel and a fellow scientist on an expedition in northern Norway took the first successful image and thereby revolutionized the study of the northern lights.

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On this day in 1998 - January 6th - NASA's Lunar Prospector was launched.

The mission was designed to investigate the Moon from a low polar orbit, including mapping the surface composition and locating lunar resources, and measuring magnetic and gravity fields.

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On this day in 1610 - January 7th - Galileo wrote the first letter in which he describes his observations of the Moon through a telescope.

Galileo's studies showed that the Moon was not the perfect sphere that people believed in at that time. The surface was uneven with mountains, plains and valleys.

Last edited by Mona - Astronomy; 01/13/17 01:51 AM.
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On this day in 1610 - January 7th - Galileo first saw three of the moons of Jupiter.

The three objects that he saw through the telescope near Jupiter were the moons now known as Callisto, Io and Europa, three of the four Galilean moons.

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On this day in 1942 - January 8th - Stephen Hawking was born.

Hawking is possibly the most famous living scientist. For thirty years he held the prestigious post of Lucasian Professor at Cambridge, though he retired a number of years ago. (Isaac Newton also once held this chair.) He's best known for his work on black holes.

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On this day in 1587 - January 8th - Johannes Fabricius was born.

Fabricius was a Frisian/German astronomer, eldest son of David Fabricius who was also an astronomer. In their solar observing they discovered sunspots about the same time and independently of Galileo.

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On this day in 1839 - January 9th - Thomas Henderson published his determination of the distance to Alpha Centauri.

Henderson had been the first to succeed in using stellar parallax to calculate the distance to a fixed star, but had delayed publishing his results and not gotten the credit.

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On this day in 1946 - January 10th - The US Army Signal Corps had the first successful echo detection of a radar signal bounced off the Moon.

It was part of the first experiment in radar astronomy, a technique later used to map Venus.

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On this day in 1787 - January 11th - William Herschel discovered the Uranian moons Titania and Oberon.

William Herschel didn't name the moons of the planet he discovered. His son John named them.

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