NASA's chief scientist will retire in 2022

NASA is about to close an important chapter in its history. Chief Scientist Jim Green, who has worked at the agency for over 40 years, now plans to retire in early 2022. He started by developing NASA's equivalent to the internet (the Space Physics Analysis Network) shortly after he arrived in 1980, but he's best known for overseeing some of NASA's biggest space exploration projects in the past 15 years -- you're likely very aware of his work. Green directed NASA's Planetary Science Division duri...