Fuel sav­ing costs months in space

Science Illustrated - - SPACE -

The least en­ergy-in­ten­sive route be­tween Earth and Mars is via a Hohmann trans­fer or­bit, by which the rocket gains just enough speed for its el­lip­ti­cal or­bit to peak by Mars’ or­bit. So, the quan­tity of fuel is ac­cu­rately cal­cu­lated, mak­ing the launch much sim­pler, but the route is only open ev­ery 26th month due to the re­quired planet po­si­tions.

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