Question: What is the biggest anmade crater and can be seen from Earth orbit?
Sentence (from "Sedan (nuclear test)"): Storax Sedan was a shallow underground nuclear test conducted in Area 10 of Yucca Flat at the Nevada National Security Site on July 6, 1962 as part of Operation Plowshare, a program to investigate the use of nuclear weapons for mining, cratering, and other civilian purposes.
Relevant evidence: No