In honor of #InternationalWomensDay, here's a scientist you should've heard about more. This is Katherine Johnson. She worked for #NASA, where she was instrumental in the #Apollo11 flight to the moon by calculating its trajectory. When the space agency started using computers, they called upon Johnson to verify their accuracy. For many years, she continued to work in the male-dominated field by proposing new celestial navigation courses and working on plans for potential space missions. #katherinejohnson #celestialnavigation #spaceexploration #marsmission #computers #navigation #space #ifls #iflscience #science #womeninscience #stem #womeninstem #womensday #womensday2015 @nasa_marshall @nasastennis @explorenasa @nasagoddard @nasajohnson @nasakennedy @nasaames