July 21, 2026 Quick space links
Courtesy of BtB’s stringer Jay. This post is also an open thread. I welcome my readers to post any comments or additional links relating to any space issues, even if unrelated to the links below.
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- Video of startup Gitai’s Inchworm robots building a tower
The robots are proposed for building lunar bases. The company also builds satellites and has a lunar rover in the works.
- The case of the Sun’s missing silver
Scientists were simply not measuring it properly.
- On July 21, 1961 Liberty Bell-7, the second Mercury mission, was launched, carrying Virgil “Gus” Grissom
The short sub-orbital flight reached an altitude of over 118 miles and traveled about 300 miles downrange. Upon splashdown the hatch inexplicably blew off and the capsule sunk, though Grissom escaped unharmed.
- On July 21 1973 the Soviet Union launched the Mars-4 orbiter, which failed to enter orbit due to a defective computer chip
This defective chip design impacted almost all of the 1970s Soviet Mars missions.
- On July 20, 1999 Gus Grissom’s Liberty Bell-7 capsule was successfully retrieved from the ocean floor
Because the hatch was not found, the recovery did not determine the cause of the hatch blowing off. Later analysis of archival film however suggested a static charge took place when the recovery helicopter’s haul cable made contact, a charge that could have caused the release.


