Which Happened First?

Viking 2

Viking 2
Image: NASA · Public domain · source

The Viking 2 mission is part of the American Viking program to Mars, and consisted of an orbiter and a lander essentially identical to that of the Viking 1 mission. Viking 2 was operational on Mars for 1281 sols.

Summary from Wikipedia (CC BY-SA 4.0) · Dates from Wikidata (CC0)

Which happened first?

Timeline

  1. Korabl-Sputnik 4March 9, 1961
  2. Tyazhely SputnikFebruary 4, 1961
  3. Zond 2November 30, 1964
  4. Luna 16September 12, 1970
  5. Viking 1August 20, 1975
  6. Viking 2 (this page)September 9, 1975

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