October 15

1829 – Astronomer Asaph Hall is born. He is noted for discovering, naming, and calculating the orbits of two of Mars' moons, Phobos and Deimos.
1924 – Actor Mark Lenard (Sarek) is born.
1997 – The Cassini probe launches from Cape Canaveral on its way to Saturn.
2001 – NASA's Galileo spacecraft passes within 112 miles of Jupiter's moon Io.
2003 – China launches Shenzhou 5, its first manned space mission.