Spaceflight
Wednesday's fatal plane crash occurred while no one was leading the agency in charge of air safety.
NASA has said for months it plans to bring the pair of astronauts home soon.
SpaceX has caught its Starship rocket back at the pad following liftoff.
The Democratic senator said the absence of an ethics agreement for Musk would amount to "an invitation for corruption on a scale not seen in our lifetimes."
WHAT'S HAPPENING
The late night host replayed the clip in slow motion to try to figure out what was going on.
The two have been a regular presence at each other's sides in recent months.
One of the Americans ended up spending the night there for an undisclosed “medical issue.” NASA declined to say who was hospitalized or why, citing medical privacy.
"That would be concerning, particularly for NASA, the Department of Defense, for some of the intelligence agencies," said administrator Bill Nelson.
Billionaire Jared Isaacman, two SpaceX employees and a former Air Force pilot are the crew of Mission Polaris Dawn.
Robert Picardo, who has starred in the franchise since 1995, responded on social media after Musk made a reference to the fictional Starfleet Academy.