Mariner Unmanned Spaceflight

Mariner 7 launched

Mariner 7NASA and JPL launch the unmanned Mariner 7 space probe on a mission to Mars, where it will be joined by its recently-launched identical twin, Mariner 6. Mariner 7 will take five months to reach the red planet, but on a slightly faster trajectory it will arrive just days behind Mariner 6. Both will fly past Mars twice as close as the planet’s previous unmanned visitors.