Extract this scenario into your orbiter folder. It will place a scenario called Venus_Stranded.scn in your Orbiter scenarios folder. Run this scenario with limited fuel. The object is to manoevre the Deltaglider to Earth. Record your flight as proof of completion. Consider arrival at Earth a success if you are within 500 km agl of the surface of Earth and the Pe is anything from surface up to 30 km agl. (Meaning you are about to enter the atmosphere.) If you have given up on the task, you can watch a non annotated replay of a successful flight by downloading this zip file. You can get a date and general trajectory by turning on TransX while watching the playback.