Mariner 4 successfully passes by Mars at a distance of just over 6,000 miles, and transmits the first direct measurements of the Martian environment to Earth, along with the first pictures ever taken of another planet from a nearby spacecraft. Mariner 4’s onboard instruments detect a thin atmosphere – thin enough that any future landing attempts will need to descend on retro rockets, but thick enough that a heat shield is still necessary. These findings have a ripple effect on NASA’s plans for a robotic Mars lander. After its flyby of Mars, Mariner 4 continues on into deep space.
theLogBook.com
https://www.theLogBook.com
Earl Green is the creator, curator, and head writer of theLogBook.com.
Also of interest...
TIROS-5
June 19, 1962
Magellan: mapping Venus in stereo
January 15, 1992
Galileo lives!
December 17, 2002