NASA @NASA
Here’s our updated plan to bring Mars samples to Earth: The @NASAPersevere rover will take samples to a lander, so a robotic arm provided by @ESA can load them into an ascent vehicle. Two Mars helicopters will act as back-ups. Targeting return in 2033. https://t.co/jUMh6vMKnR https://t.co/TOWFpp3sOk — PolitiTweet.org