Chrono #316 answer
12 November 2026 · “Milestones Beyond Earth” · Level 3 of 5
The correct order, oldest first:
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1961 · 12 April 1961
Vostok 1
Vostok 1 lifted off on 12 April 1961, and Gagarin completed one orbit of Earth in about 108 minutes.
Image: Tempe · Public domain · resized · original on Wikimedia Commons
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1968 · 21 December 1968
Apollo 8
Apollo 8 launched in December 1968, and its crew orbited the Moon ten times on Christmas Eve.
Image: NASA · Public domain · resized · original on Wikimedia Commons
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1975 · 20 August 1975
Viking 1
Viking 1 launched in August 1975, and its lander touched down on Mars in July 1976.
Image: NASA · Public domain · resized · original on Wikimedia Commons
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1986 · 19 February 1986
Mir
Mir's core module launched in February 1986, and the station stayed in orbit until its controlled deorbit in 2001.
Image: Original image: NASA/Crew of STS-91 Retouched image: Thegreenj · Public domain · resized · original on Wikimedia Commons
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1997 · 15 October 1997
Cassini–Huygens
Cassini–Huygens launched in October 1997, and its Huygens probe landed on Titan in January 2005.
Image: NASA · Public domain · resized · original on Wikimedia Commons
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2009 · 7 March 2009
Kepler space telescope
Kepler launched in March 2009 and confirmed more than 2,600 exoplanets before it was retired in 2018.
Image: NASA · Public domain · resized · original on Wikimedia Commons
