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Asked by yoreni to Craig, Flavia, Giuditta, Jack, Sheona on 11 Nov 2015.
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Jack Carlyle answered on 11 Nov 2015:
There’s a couple of reasons. Firstly, is that it’s SO expensive to get there, and it would be even more expensive to come back! Secondly, is that would mean you’d need to take twice as much fuel, which would make the whole thing much more difficult. But thirdly, is that in order to travel from one planet to another, you have to wait until the orbits of each planet are in the perfect place such that the planets are the closest they could possibly be. This doesn’t happen very often, so even if the astronauts could come back, they’d have to wait a very long time to do it.
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Giuditta Perversi answered on 11 Nov 2015:
Basically, the fuel it’s a huge problem and launching a spacecraft it’s not so easy!
Going to the Moon was already complicated, but Mars is 6 months away from the Earth!
The more equipment you want to bring on your way out, the bigger the spacecraft needs to be and the more fuel you need to use to escape the atmosphere and the gravitational pull of the Earth.
Once you’re out it’s easier to keep travel, but if you want to be able to be back you need to land with all your extra weight and extra fuel and being able to set up a launching facility (really precise for you to be able to go back on Earth safely, in 6 months) directly on Mars.It’s a crazy amount of work and if anything goes wrong there is no return!
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