At least one non-governmental group, calling itself the Mars Society, has been actively studying technologies appropriate to send a crew of from four to six astronauts to Mars for a roughly two-year stay.<ref name=marssoc>[http://www.marssociety.org/portal The Mars Society] global and USA portal. Accessed May 27, 2008.</ref>
In 2012 a rover named called "Curiosity" landed on the Mars. It The rover is controlled by the first Martian lander to use RTGs (Radioisotope thermoelectric generators) instead of solar panels[[NASA]] on Earth and in 2013 it could even drill in the Mars.<ref>http://www.nasa.gov/mission_pages/msl/multimedia/pia16728.html</ref>
==Satellites==