NASA @NASA
50 years ago, #Apollo12 astronauts Pete Conrad and Alan Bean reached the robotic Surveyor 3 on their 2nd moonwalk. Surveyor landers helped blaze a trail for humans to land on the Moon — just as our #Mars2020 rover will help prepare to land humans on Mars. https://t.co/9SzDBU0O2Q https://t.co/cDTQKdXg5b — PolitiTweet.org