SpaceX CEO Elon Musk took to Twitter after an account shared a video showing two SpaceX rockets landing back-to-back on Earth. "It is inspiring to think that humans did that," Elon stated. His brother, Kimbal Musk, also reacted on the video, saying, "Bucket list item for literally everyone...See Falcon 9 double boosters land in person. Go to Cape Canaveral."