Heavier rockets would need more fuel, making them even heavier. SpaceX aims to solve this problem by sending separate rockets with fuel tankers to refuel the spaceship already arrived in space.
Both mars and the earth have elliptical orbits, which require a spacecraft to follow weird paths in space harnessing the surrounding gravity to save fuel. To go on a shorter path, a spacecraft would need more fuel. As you may guess, SpaceX has the same solution to this problem — refill.
More than 10, potentials finished the job application process, and Mars One narrowed down the applicants, first to round 2 candidates and then to round three candidates. In and , Mars One had feasibility studies performed by Lockheed Martin , for a first robotic mission and with Paragon Space Development Corporation, for Mars suits and life support systems.
In Mars One ran out of funds and was unable to continue the selection program and the technical studies. In the years after that, several attempts were made to raise additional funds, but they were unsuccessful. Despite that, Mars One has had an impact on Mars exploration by promoting the idea of permanent settlement. The risk of doing a return mission before you have adequate launch infrastructure on Mars is simply too great. The first time you hear the idea of permanent settlement, you might think it is out there.
But the second or the third time, you realize that some humans are and have always been explorers. Throughout history, there have been humans with explorer genes that picked up their stuff and tried to settle in a place where no human had gone before.
Exploration has never been free of risk, and all space exploration presents very real risks and challenges. Establishing a permanent settlement on Mars is very complex, but it is far less complex, less risky, and requires much less infrastructure sent to Mars than return missions. This saves a lot of fuel, but can result in missions that take years to reach their destinations.
Clearly this is something humans would not want to do. Both Earth and Mars have almost circular orbits and a manoeuvre known as the Hohmann transfer is the most fuel-efficient way to travel between two planets. Basically, without going into too much detail, this is where a spacecraft does a single burn into an elliptical transfer orbit from one planet to the other. A Hohmann transfer between Earth and Mars takes around days between eight and nine months and is only possible approximately every two years due to the different orbits around the Sun of Earth and Mars.
A spacecraft could reach Mars in a shorter time SpaceX is claiming six months but — you guessed it — it would cost more fuel to do it that way.
A spacecraft entering Earth is able to use the drag generated by interaction with the atmosphere to slow down. The latter, once again, requires more fuel. So we need to be very selective about where we choose to live on Mars and how we manage temperature during the night. We would need to build a climate-controlled place just to live there.
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