Astronauts at the International Space Station have finished installing a Canadian robotic device to help with future maintenance and construction at the orbiting facility.

In two days of frank discussions behind closed doors, a group of 50 engineers, former astronauts, scientists and former NASA executives concluded that the United States should explore Mars, but needs to rethink how and when to get there.

Following recent media reports that U.S. astronauts have on occasion flown drunk, NASA will consider instituting limited testing of flight crews and employees, the agency's director said.