[Answer] In 1971, a memorial to Gus Grissom, Ed White, and Roger Chaffee was left where?

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In 1971, a memorial to Gus Grissom, Ed White, and Roger Chaffee was left where?

• On the moon:On January 27, 1967, tragedy struck on the launch pad at Cape Kennedy during a preflight test for the mission that would be known as Apollo 1. The mission was to be the first crewed flight of Apollo, and was scheduled to launch the next month. Astronauts Virgil Grissom, Edward White and Roger Chaffee perished when a fire swept through the command module, becoming the first Americans to die in a spacecraft. In 1971, the Apollo 15 mission left a plaque on the Moon containing the names of the Apollo 1 astronauts, along with two Soviet cosmonauts, who perished in the pursuit of human space flight.

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