REFERENCIAS:

 

http://mars.nasa.gov/allaboutmars/facts/

 

http://www.nasa.gov/jpl/msl/nasas-curiosity-rover-views-serene-sundown-on-mars

 

http://www.jpl.nasa.gov/video/details.php?id=1375

 

https://www.youtube.com/watch?v=OCaQsF91vyc