The wispy atmosphere of Mars is 99 percent thinner than Earths — not great for slowing down space ships or metorites. NASAs testing a way to make it work, however, using a helium balloon, rockets and a Low Density Supersonic Decelerator (LDSD) vehicle, which looks suspiciously like a UFO. The plan is to launch the LDSD to 120,000 feet using the balloon, then push it to the edge of space (180,000 feet) with the powerful solid-fueled rocket.
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