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What happened to Apollo 2, 3, 4, 5 and 6? – "NASA's missing missions weren't actually missing"

The Apollo program famously went from Apollo 1 to Apollo 7, leaving what looks like a mysterious five-mission gap in one of the best-documented programs in history. In reality, the missing numbers are ...
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In 1970, NASA deliberately crashed Apollo 13’s rocket into the moon; the impact made the lunar interior ring for over three hours

Apollo 13 will always be remembered as the mission that failed spectacularly. The oxygen tank exploded two days into the journey; there was no moon landing; and the astronauts who made it back to ...