Companies are developing technologies to mine resources from the lunar surface, but some analysts say there are still big limitations to what the industry can achieve. WSJ visited Astrobotic, a start-up working with NASA, to find out more. Photo illustration: Ryan Trefes More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com/ Visit the WSJ Video Center: https://wsj.com/video On Facebook: https://www.facebook.com/pg/wsj/videos/ On Twitter: https://twitter.com/WSJ On Snapchat: https://on.wsj.com/2ratjSM #NASA #SpaceMining #WSJ