There are myriad reasons why getting from Earth to Mars is hard, but chief among them are two 1) the massive amount of fuel needed and 2) a launch window that is limited to every 26 months, when the two planets are in optimal alignment. A couple of mathematicians have calculated a new path to Mars that solves both — and it’s far from a straight line.
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Currently, the favored method for getting a spacecraft into orbit around Mars is the “Hohmann transfer.” After rocketing through the Earth’s atmosphere, the craft make a beeline for the Red Planet, barreling through space at high speeds. As it approaches Mars, its thrusters fire in the opposite direction — slamming on the brakes and swinging the craft into orbit.
The Hohmann transfer is a highly effective move — road-tested and reliable. But it is expensive and time specific. Launches are limited to a brief window when the orbit and rotation of Earth and Mars are just right.
Ballistic capture, spacecrafts are “casually lobbed into a Mars-like orbit” flying ahead of the planet. The spacecraft sets its cruise slower than Mars’ revolutionary speed around the sun, and when the planet catches up with the spacecraft, its gravity snags it and pulls it into its orbit.
“It’s an eye-opener,” says James Green, director of NASA’s Planetary Science Division. “It could be a pretty big step for us and really save us resources and capability, which is always what we’re looking for.”
NASA has used the ballistic capture technique on one of its lunar missions — the GRAIL mission in 2011. The European Space Agency also used the technique for its SMART-1 lunar mission in 2004.
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Abstract Source: https://goo.gl/CYOYvl.