selected
The Soviet space probe Venera 4 became the first spacecraft to perform direct in situ analysis of the environment of another planet (Venus).
Related Wikipedia articles
Venera 4
1967 Soviet Venus probe
Venera 4, also designated 4V-1 No.310, was a probe in the Soviet Venera program for the exploration of Venus. The probe comprised a lander, designed to enter the Venusian atmosphere and parachute to the surface, and a carrier/flyby spacecraft, which carried the lander to Venus…Source: Wikipedia (CC BY-SA)
In situ
Latin phrase that translates literally to 'on site'
In situ is a Latin phrase meaning 'in place' or 'on site', derived from in ('in') and situ. The term typically refers to the examination or occurrence of a process within its original context, without relocation. The term is used across many disciplines to denote methods,…Source: Wikipedia (CC BY-SA)
Venus
Second planet from the Sun
Venus is the second planet from the Sun. It is often called Earth's "twin" or "sister" among the planets of the Solar System for its orbit being the closest to Earth's, both being rocky planets and having the most similar and nearly equal size and mass. Venus, though, differs…Source: Wikipedia (CC BY-SA)