NASA lift vehicle. The Space Launch System is intended to launch the Orion Multi-Purpose Crew Vehicle and other elements towards the Moon, near-Earth asteroids, and one day Mars. The Orion MPCV conducted an unmanned test launch on a Delta IV Heavy rocket in December 2014. The James Webb Space Telescope (JWST) is currently scheduled to launch in May 2020. On August 6, 2012, NASA landed the rover "Curiosity" on Mars. On August 27, 2012, "Curiosity" transmitted the first pre-recorded message from the surface of Mars back to Earth, made by Administrator Charlie Bolden: NASA's ongoing investigations include in-depth surveys of Mars
Crewed Mars rover rovers, because they need to know at least roughly where they are and where they are going to get to a destination. Dead reckoning was the method used by the Mars Pathfinder rover "Sojourner" for navigation. A GPS satellite network for Mars would mean a constellation of satellites in Mars orbit, but one alternative would be a surface based pseudo-satellites array. These devices would have to be emplaced with high precision, unless they were self-calibrating. An example of criteria for humaned Mars surface rover was expressed by NASA in the surface variant of the aforementioned SEV, in development in during