Blue Origin, owned by Jeff Bezos, and Lockheed Martin are among the contractors that could compete with Elon Musk's company in the race back to the lunar surface.
Gaza's relief service said at least nine people, including several children, were killed in the strike in northern Gaza on Friday, underscoring the fragility of the week-long ceasefire.
As director of psychiatry at Bellevue Hospital, he guided first responders and grieving families through the trauma caused by the 2001 terrorist attack.