On this Day in History

On this Day in History in 295: 8th recorded perihelion passage of Halley’s Comet.
 
On this Day in History in 1702: Comet C/1702 H1 approaches within 0.0437 AUs of Earth.
 
On this Day in History in 1902: Marie & Pierre Curie isolate the radioactive element radium chloride.
 
On this Day in History in 1940: The First electron microscope was demonstrated by RCA.
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On this Day in History

On this Day in History in 1904: US Congress authorizes Lewis & Clark Expo $1 gold coin.
 
On this Day in History in 837: Best view of Halley’s Comet in 2000 years.
 
On this Day in History in 1970: Apollo 13 announces “Houston, we’ve got a problem!” as Beech-built oxygen tank explodes en route to Moon.