Space agency leaders still aren't sure how to send humans on a months-long journey to Mars, lacking either the propulsion system and/or radiation safeguards necessary. Humans to Mars by 2030 seems like one tall order. READ MORE HERE: https://washex.am/2ycpmSe #NASA60pic.twitter.com/92giQPSiPG
4:30 AM - 3 Oct 2018
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