The content originally appeared on: CNN A version of this story appeared in CNN's Wonder Theory science newsletter. To get it in your inbox, sign up for free here. The most powerful rocket NASA has ever built, the Space Launch System is now ready for a final prelaunch test for the uncrewed Artemis I mission. Known as a wet dress rehearsal, the trial includes loading the fuel tanks and conducting a launch countdown. Ultimately, the plan is to use the […]