Each statement below represents a feature that has been claimed to exist on Mars. Sort the statements into the correct bin according to whether each is a feature that actually exists, that does not actually exist, or that might exist but about which we cannot yet draw a definitive conclusion.
Real Mars/Imaginary Mars/Unknown Mars
1. Minerals of types known to form in liquid water
2. surface pools of liquid warer
3. microscopic life
4. abundant water ice
5. dried-up river beds
6. a network of straight-line canals
7. cities built by an ancient civilization
8. underground pockets of liquid
9. frequent rainfall and snowfall
Ans;
Real Mars:
1. Minerals of types known to form in liquid water
4. abundant water ice
5. dried-up river beds
Imaginary Mars:
2. surface pools of liquid water
6. a network of straight-line canals
7. cities built by an ancient civilization
9. frequent rainfall and snowfall
Uknown Mars:
3. microscopic life
8. underground pockets of liquid
Notice that there is no evidence of any Martian civilization past or present, but there is evidence that Mars once had surface liquid water, which raises the possibility that it might still have underground pockets of liquid water and, perhaps, microscopic life.
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