Is this OK: Most likely, if there is mars on life it would be hard to find.
Presumably you mean "life on Mars" not "mars on life"? Note that "Mars" has a capital. With these corrections it is acceptable, but strictly speaking "will" is a better fit than "would".
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Presumably you mean "life on Mars" not "mars on life"? Note that "Mars" has a capital. With these corrections it is acceptable, but strictly speaking "will" is a better fit than "would".