OK
1. All planets and yes even stars are made of the same elements, the variances come in the density, Jupiter for instance is almost large enough to become a star (almost is in cosmic terms)
2. determining the various gases and whatnot that are on a planet is a relatively simple process even through a telescope, different elements reflect light in different wavelengths, by looking at the light you can get the basics. When you land a probe there you can determine even trace amounts of elements.
Finally in terms of what its worth the answer is what is it worth to know where we came from and where we may be going, what would it be worth to colonize another planet. What would it be worth to find remnants of an advanced civilization there that has long since died.
The possibilites are close to endless. So what is knowledge worth?
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Mike South
It's No wonder I took up drugs and alcohol, it's the only way I could dumb myself down enough to cope with the morons in this biz.
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