Pluto Flyby Occurs 50 Years After 1st Mars Encounter
Tuesday, July 14, 2015 - 04:30
in Astronomy & Space
The New Horizons probe's epic flyby of Pluto today (July 14) comes on a very special date in the history of space exploration: Exactly 50 years ago today, NASA's Mariner 4 spacecraft made the first flyby of Mars.