November 23

1924 – Edwin Hubble's discovery that the Andromeda "nebula" is actually another island galaxy far outside our own Milky Way, is first published in The New York Times.
1963 – The BBC broadcasts "An Unearthly Child", the first episode of the scifi show Doctor Who, which is now the world's longest running science fiction drama.
1964 – Dr. Michael E. DeBakey of Houston performs the first successful coronary artery bypass graft procedure.
1992 – The first "smartphone", the IBM 'Simon', is introduced at COMDEX in Las Vegas, Nevada.
2015 – The "New Shepard" space vehicle became the first rocket to successfully fly to space and then return to Earth for a controlled, vertical landing.