Other comments during his town hall touched on how discrimination will fare in his agency, the risks of human spaceflight and the fate of the agency's next major telescope.
"We see a distinctive pattern of the wet land areas of the world getting wetter...and the dry areas in between getting dryer."
Where do they come from? How do they work? And of course, will they help us find aliens?
Researchers believe the Roman Empire was economically stronger—and dirtier—than the much-lauded republic that inspired the founders of the U.S.
The birds are carefully adapted to the absentee parenting lifestyle.
In order to identify what 2004 EW95 was made of, the team studied the light reflected off of it.
“It’s been 30 years of frustration and 10 years of getting ready to go to Mars.”
It's a dog-eat-dog world out there, even for plants.
The mission ended in 2003, but a bunch of its data had never been studied closely.
The tiny planet is built kind of like a peanut M&M.
NASA says some of the rover's instruments will still find their way to the Moon.
The lander does use essentially the same shield, but its equipment has been double-checked.