Newsuser "Brian Davis" wrote ...

A good science is to send a probe which is able to work all 5 years!

Sure. Good science would be to put hundreds of trained geologist on
the surface of Mars, with equipment to traverse the surface.

Oh, yes, but explain it to the people ...

But economicly, there might be some constraints here.

More serious problem is to take risk when a lot of people expects that life
should be easy and nice form year to year.

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(STS)