http://www.newsweek.com/watch-nasa-wet-dress-rehearsal-test-sls-rocket-artemis-1693825

NASA is set to begin testing its huge moon-bound Space Launch System (SLS) rocket on Friday, and the procedure will be livestreamed.

SLS was transported to a NASA launch pad two weeks ago after spending several years under construction. The rocket is to form the backbone of the space agency's plans to return astronauts to the moon for the first time in decades within the next few years, and onwards to Mars.