Where to Watch Today's Nasa & SpaceX Launch Live

tvguide.com:

Update 5/30 11 a.m. ET: The SpaceX/NASA launch is scheduled for Saturday, May 30 at 3:22 p.m.

ET, barring any changes. You can watch a live stream of the launch on NASA's YouTube channel or on its website, or on SpaceX's YouTube channel.

If today's launch is scrubbed, they'll try again tomorrow at 3 p.m. ET.   Update 5/27 1:15 p.m. PT: Due to weather concerns, the SpaceX Launch of NASA astronauts was called off on Wednesday, May 27, but the plan is to reschedule for later this week.

The next opportunities to launch are Saturday, May 30 at 3:22 p.m. ET and Sunday, May 31 at 3 p.m. ET. America will meet a couple of milestone moments on Wednesday as a spacecraft carrying astronauts takes off from U.S.