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This is NASA's Low-Density Supersonic Decelerator, "a rocket-powered, saucer-shaped test vehicle" designed to land huge payloads on Mars. So there—suck on that Martians, because after all these decades of sci-fi invasions, we are going to be the ones seizing your planet with our very own flying saucers.
Does waiting in line at a museum just to check out some old dinosaur bones that may or may not be real sound like a terrible way to spend a weekend? If you've got a 3D printer at home, MakerBot's Digital Store is now selling this anatomically correct T-Rex skeleton model that you can print at home as a start to your own personal private museum.