The InSight mission livestream showed a jar of peanuts with what appears to be the MarCO logo.
Why is was this a significant shot in the livestream? Is there history behind this?
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It turns out this goes way back to the 1960s. Landing on a celestial body isn't easy; JPL had suffered a series of failures during the Ranger missions, some during launch and others further on in each mission. For Ranger 7, someone on the team (credit has been given to both Dick Wallace and Harrison Schurmeier) passed out peanuts to calm people's nerves . . . and the landing was successful. Since then, it's become a tradition at JPL.
I've confirmed that peanuts have been consumed on the following missions (this is only a partial list, in all likelihood):
. . . and likely many more.