(Problem)
http://dwteach.com/
(Mission)
http://www.mars-one.com/mission
(Gravity Mass)
http://hyperphysics.phy-astr.gsu.edu/hbase/mass.html
(sites)
http://earth-mars-sun-align-opposition
http://www.mars-one.com/mission
(Video for more info. about mars)
http://www.youtube.com/watch?v=3YDnGHaXdxw
http://dwteach.com/
(Mission)
http://www.mars-one.com/mission
(Gravity Mass)
http://hyperphysics.phy-astr.gsu.edu/hbase/mass.html
(sites)
http://earth-mars-sun-align-opposition
http://www.mars-one.com/mission
(Video for more info. about mars)
http://www.youtube.com/watch?v=3YDnGHaXdxw