Viking 1 and 2 landed on Mars and taught us a lesson: we don't have an accurate definition for life.

Voyager 1 and 2 soared across the solar system and taught us another lesson: every world is different from the other.

We can't find life as we know it, so we're looking for liquid water.

If we can't find liquid water, we're looking for planets that might look like ours.

The more we find out, the more difficult it gets to find life. Probabilities, what we observe make it more elusive. At least it uncovers what we had imagined which turned out to be wrong.

Mars is a succession of hopes and disappointments.

And, meanwhile, we discover other things: more and more galaxies, more and more ancestors , things far away in space and time.

Why always coming back to what looks like what there is on Earth, life, while every time we discover new things, we learn something is different from what we thought?

Life must have started a long time ago on earth and there must have been a very first living thing, appearing.
Will we ever find it?
Will we ever find (or trace, rather) the star that produced all matter we know (and ourselves) and exploded in order to re-create a sun with its planets?

But, for the moment, the Graal is extra-terrestrial life....Why? Would it be so unbearable to understand we're alone?
Do we secretly long for extra-terrestrial intelligence? More advanced than us? Why? Because it would save us? Like a Cargo Cult !

There is an extremely thin line between saving us and destroying us! The only way to save us might very well be to destroy all that made what we are, our cultures...

So, why that obsession with life elsewhere?