. On this day in 1910 – October 19th – Indian-American astrophysicist and Nobel laureate Subrahmanyan Chandrasekhar was born in Lahore [now part of Pakistan].
He's known for his work in stellar evolution including black holes. The Chandrasekhar Limit is the dividing line between the mass of a star that has spent its nuclear fuel and will collapse into a white dwarf and one massive enough to go out with a bang - a supernova. It's about 1.4 times the Sun's mass.
. On this day in 2016 – October 19th – the European Space Agency's ExoMars mission arrived at Mars.
There were two parts to the mission. The Trace Gas Orbiter (TGO) was successfully inserted into orbit and is working as expected. However due to a systems malfunction, the experimental lander Schiaparelli crashlanded on Mars.
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