How do you move a 3.5 million-pound (almost 1.6 million-kilogram) rocket to its launch pad? That's the task NASA had to undertake in preparation for the Artemis II mission. To transport the impressive spacecraft, they used the Crawler-Transporter 2, the heaviest self-powered vehicle on Earth. Here's how it worked: https://on.natgeo.com/4jUx0ax | National Geographic