蜜芽传媒

Mike Massimino overcame being rejected by NASA - twice - before of become an astronaut. He's since completed 30 hours of space walks, serviced the Hubble telescope and was the first man to tweet from earth's orbit.

(Credit: NASA astronaut Mike Massimino in New York City on June 30th 2016. Image: Getty Images/Noam Galai/WireImage)