Bill Nelson has stepped down as NASA administrator, ending a half-century of public service. Janet Petro is now the agency's ...

Bill Nelson retires as NASA administrator; Janet Petro steps in as acting chief, awaiting Jared Isaacman’s confirmation.

"America is leading humanity back to the Moon, onward to Mars, and into a golden age of space exploration," Nelson wrote, ...

NASA Administrator Bill Nelson has left the building, and while President Trump’s nominee awaits a confirmation hearing, the ...

NASA employees received a memo from acting agency administrator Janet Petro, Wednesday, mandating the closure of all ...

Robert Cabana, a NASA associate administrator, astronaut, and a colonel in the United States Marine Corps, received the ...

An exploding budget and an unraveling schedule spell disappointment for NASA's mission to learn more about Mars's history.

NASA hopes a revised plan will get Mars samples back to Earth faster and cost less than the agency's original plan.

KENNEDY SPACE CENTER — With less than a month left to go before stepping down as head of NASA, Bill Nelson warns his stance on conflicts of interest might not be the same as his likely ...

For nearly half a century, NASA has been talking an awfully good game about its much-heralded Mars Sample Return (MSR) project. As long ago as 1978, the space agency requested funding to develop a ...