NASA has long been able to check out Mars on the ground with rovers and landers and from far above with orbital spacecraft. Now, it wants to prove that it can sustainably fly around the planet's thin atmosphere at low altitude -- with a tiny helicopter.
원문출처 : https://www.cnn.com/2018/05/12/us/mars-helicopter/index.html
원문출처 : https://www.cnn.com/2018/05/12/us/mars-helicopter/index.html