Since 1942, the Johns Hopkins University Applied Physics Laboratory (APL) has been at the center of innovative space exploration and engineering. From placing cameras on rockets to capture the first pictures of Earth from space to crafting the first low-cost mission to the outer planets, APL has been a pioneer for delivering low-cost planetary science. APL has designed and built 69 spacecraft and more than 150 specialized instruments that have visited every planet in our solar system and collected information critical to expanding humankind’s understanding of the universe.