the source of life

No, we wouldn't.I'll deal with the Earth first. Imagine the first replicator, a humble string of amino acids that by luck happens to, under just the right circumstances, be able to string free floating amino acids together into another copy of itself. Let's suppose it was formed near a hydrothermal vent.What do you think will happen to that fragile string of amino acids when a highly developed cell such as a bacteria stumbles upon it? Do the words 'Nom nom nom' mean anything to you?Now, suppose this same string formed on another planet. How, do you think, would we know?

This is, as far as I can tell, a non sequitur? I was talking about life on Earth. Exactly. Now, wasn't it you who with a little touch of hyperbole claimed '1 mile closer to the sun we would burn up, 1 mile further away we would freeze'? Wrong in point of fact, but true in broad principle. The Earth is the only planet we know of that is suitable for the kind of life we know. The reason we don't see life on the other planets in the solar system is because conditions on those planets were not conducive to the development of advanced life.I suspect, although do not know, that we will eventually discover that microscopic life exists on other bodies in our solar system, but we have no current way of knowing.