By 2035, NASA wants to land humans on Mars. But reaching the red planet, on average around 140 million miles away, will be a mammoth feat.
원문출처 : https://www.cnn.com/2021/02/03/world/nuclear-powered-rocket-scn-spc-intl/index.html
원문출처 : https://www.cnn.com/2021/02/03/world/nuclear-powered-rocket-scn-spc-intl/index.html