SpaceX pulled off a historic mission in 2020, cementing Elon Musk’s place in the future of space exploration. Achieving a feat many years in the making, the SpaceX team sent astronauts into space and brought them back home safely. And while it was a landmark success, there was also a major unforeseen hiccup — that could have doomed the entire mission. Photo Credit: Pool Photo by Jim R. Bounds-Pool/Getty Images