Members of the AMADEE-18 Mars simulation mission ride all-terrain vehicles while wearing spacesuits during an analog field simulation in Oman's Dhofar desert on February 7, 2018, in a collaboration between the Austrian Space Forum and the Oman National Steering Comittee preparing for future human Mars missions. (Photo by Karim Sahib/AFP Photo)





In this February 7, 2018, photo, two scientists test space suits and a geo-radar for use in a future Mars mission in the Dhofar desert of southern Oman. The desolate desert in southern Oman resembles Mars so much that more than 200 scientists from 25 nations organized by the Austrian Space Forum are using it for the next four weeks to field-test technology for a manned mission to Mars. (Photo by Sam McNeil/AP Photo)





This February 7, 2018, photo shows João Lousada, a flight controller for the International Space Station, wearing an experimental space suit during a simulation of a future Mars mission in the Dhofar desert of southern Oman. (Photo by Sam McNeil/AP Photo)





Members of the AMADEE-18 Mars simulation mission wear spacesuits while conducting scientific experiments during an analog field simulation in Oman's Dhofar desert on February 7, 2018, in a collaboration between the Austrian Space Forum and the Oman National Steering Comittee preparing for future human Mars missions. (Photo by Karim Sahib/AFP Photo)





In this February 7, 2018, photo, two scientists test space suits and a geo-radar for use in a future Mars mission in the Dhofar desert of southern Oman. (Photo by Sam McNeil/AP Photo)





Members of the AMADEE-18 Mars simulation mission ride all-terrain vehicles while wearing spacesuits during an analog field simulation in Oman's Dhofar desert on February 7, 2018, in a collaboration between the Austrian Space Forum and the Oman National Steering Comittee preparing for future human Mars missions. (Photo by Karim Sahib/AFP Photo)





This February 7, 2018, photo shows João Lousada, a flight controller for the International Space Station, wearing an experimental space suit during a simulation of a future Mars mission in the Dhofar desert of southern Oman. (Photo by Sam McNeil/AP Photo)





In this February 7, 2018, photo, two scientists test space suits and a geo-radar for use in a future Mars mission in the Dhofar desert of southern Oman. (Photo by Sam McNeil/AP Photo)





The sun rises over a 2.4-ton inflated habitat used by the AMADEE-18 Mars simulation in the Dhofar desert of southern Oman on Thursday, February 8, 2018. (Photo by Sam McNeil/AP Photo)





In this February 7, 2018, photo, two scientists test space suits and a geo-radar for use in a future Mars mission in the Dhofar desert of southern Oman. (Photo by Sam McNeil/AP Photo)





In this February 7, 2018, photo, analog astronaut João Lousada, center, hands his colleague Kartik Kumar a drone while two Omani men watching in front of the Mars simulation base camp in the Dhofar desert of Oman. (Photo by Sam McNeil/AP Photo)





A picture taken on February 7, 2018 shows a member of the AMADEE-18 Mars simulation mission wearing a spacesuit standing in the doorway of a simulation habitat, with a view of the night sky above in Oman' s Dhofar desert, during an analog field simulation in a collaboration between the Austrian Space Forum and the Oman National Steering Comittee preparing for future human Mars missions. (Photo by Karim Sahib/AFP Photo)