A recent anti-satellite missile test by India added hundreds of pieces of debris to an already cluttered low-Earth orbit.
A unique concept could serve as an emergency power backup for future missions.
NASA's Lunar Gateway and a return to the Moon are the big winners in the 2020 budget proposed for the agency; the futures of planetary and Earth science are less clear.
The SPHEREX mission will create multiple surveys of the near-infrared sky that will reveal the origins of life and perhaps the universe itself.
Automation of a key process may yield an eightfold boost to U.S. plutonium production, a promising development for deep-space exploration.
NASA's next Mars rover will explore a geologically diverse crater that may once have been flooded with water, a crucial ingredient for the mission's search for evidence of past life.
After 11 Years, NASA's Dawn mission to explore Vesta and Ceres is about to come to an end.
The Japanese Hayabusa 2 spacecraft dispatched the first of a set of smaller missions that will explore asteroid 162173 Ryugu.