Several leadership roles are still vacant or have been temporarily filled since Trump took office.
Don't doubt it: "Man flu" is real, or so says one Canadian researcher who was "tired of being accused of overreacting."
The "Make Our Planet Great Again" contest was announced after President Donald Trump withdrew the U.S. from the Paris climate accord.
A new declaration from the Trump administration will order NASA to send American astronauts back to the moon with the goal of getting to Mars.
For the first time, an experimental drug has reduced levels of the toxic protein that causes Huntington's disease in humans.
Apollo 17 marked the last time humans walked on the moon, but recent talks hint at a return.