18th Day of October

1967 – Venera 4 becomes the first spacecraft to measure the atmosphere of another planet

Venera 4 (Russian: Венера-4 meaning Venera 4), also designated 4V-1 No.310 was a probe in the Soviet Venera program for the exploration of Venus.

The probe comprised an entry probe, designed to enter the Venus atmosphere and parachute to the surface, and a carrier/flyby spacecraft, which carried the entry probe to Venus and served as a communications relay for the entry probe.

1967 – Venera 4 becomes the first spacecraft to measure the atmosphere of another planet

On the 18th October 1967, it was the first successful probe to perform in-place analysis of the environment of another planet.

Venera 4 provided the first chemical analysis of the Venusian atmosphere, showing it to be primarily carbon dioxide with a few percents of nitrogen and below one percent of oxygen and water vapors.

Extra Note: While entering the atmosphere it also became the first spacecraft to survive entry into another planet’s atmosphere.

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https://en.wikipedia.org/wiki/Venera_4

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