Note that there will not be an official livestream on Youtube. Every time there are some people who fall for scammers pretending to be one and end up listening to an AI impersonation of Elon Musk try to sell them cryptocoins, missing the real launch.
If you must watch on youtube, NSF or Everyday Astronaut typically have good (unofficial) livestreams.
If you must watch on youtube, NSF or Everyday Astronaut typically have good (unofficial) livestreams.