Space craft to Mars have a very high failure rate,around 90%. Whereas craft to the outer planets have a 100% success rate.
Therefore, Marvin The Martian is killing them with his death ray gun!!
Beagle 2 landed on Christmas Day and communication has not been successful.
Maybe,there is life on Mars and they don't want us to find them ?
Must see Bugs Bunny and get him too tell Marvin to stop destroying space craft !!!!