What to Know About Today's Historic NASA/SpaceX Launch

What to Know About Today's Historic NASA/SpaceX Launch
SpaceX's Demo-2 mission has been four years in the making and will launch today, May 27, at 4:33 pm, weather permitting.
Demo-2 will mark the first launch of NASA astronauts on an commercial spacecraft and the first launch of American astronauts into orbit on a U...