As NASA researches the best (and most cost effective) ways to someday launch humans beyond low-Earth orbit once again, it’s looking back at its storied history for clues. Recently a team of young engineers got the rare opportunity to disassemble the F-1 — NASA’s most powerful rocket engine — analyze its components, and refurbish the engine anew. Despite the fact that it was completed way back in the 1950s, the F-1 remains the most powerful rocket engine ever assembled by the United States. Five F-1 engines propelled NASA’s Saturn V rocket to the skies throughout the Apollo program. The young generation of engineers were also able to reassemble and fire its gas generator, experiencing 31,000 pounds of thrust firsthand.