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On this day in 2014 - September 24th - the Indian Space Research Organisation (ISRO)'s Mars Orbiter Mission entered Mars orbit.

MOM was the India's first interplanetary mission and is still studying Mars.

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On this day in 1644 - September 25th - Danish astronomer Ole Christensen Rømer was born.

He is best known for making the first quantitative measurements of the speed of light by precisely measuring the length of time between eclipses of Jupiter by one of its moons.

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

Kirkwood is best known for his study of asteroid orbits. When arranging the then-growing number of discovered asteroids by their distance from the Sun, he noted several gaps, now named Kirkwood gaps. He associated these gaps with orbital resonances with the orbit of Jupiter.

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On this day in 2007 - September 27th - NASA's Dawn spacecraft was launched.

Dawn orbited and studied the asteroid Vesta, and then went on to dwarf planet Ceres where it is still in orbit.

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

Draper was an American physician, professor of medicine, keen astronomer and pioneer of astrophotographer. Stars with HD numbers are listed in the Henry Draper Catalog compiled by Harvard College Observatory and funded by Draper's widow, Anna Draper.

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On this day in 2016 - September 30th - ESA's Rosetta mission ended with a controlled descent to the surface of Comet Churyumov-Gerasimenko.

Draper was an American physician, professor of medicine, keen astronomer and pioneer of astrophotographer. Stars with HD numbers are listed in the Henry Draper Catalog compiled by Harvard College Observatory and funded by Draper's widow, Anna Draper.

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On this day in 1897 - October 1st - the 40-inch refracting telescope was dedicated at Yerkes Observatory in Williams Bay, Wisconsin.

From 1897-1909 it was the world's largest telescope. It's still the world's largest refractor.

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

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On this day in 1920 - October 2nd - Italian mathematician and engineer Giuseppe 'Bepi' Colombo was born.

Colombo, known as "Grandfather of the fly-by", suggested to NASA in 1970 that its Mariner 10 mission could achieve a second fly-by of Mercury by making use of the planet's gravity. A careful analysis showed this could indeed be done and was incorporated into the mission. ESA (European Space Agency) has commemorated him by naming its Mercury mission BepiColombo.

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On this day in 1935 - October 3rd - Apollo 16 astronaut "Charlie" Duke was born.

Duke was the Lunar Module Pilot of Apollo 16 and the tenth person to walk upon the surface of the Moon.

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