Within known science water, a molecule of Hydrogen and Oxygen, is absolutely necessary for building and sustaining all living things. We carry a miniature saltwater sea inside these bags of flesh, bone, and feces called our “bodies”. Along with Carbon, the solar system and galaxy seem to be awash in the stuff. Find water and you might find life.
We’ve been to the moon and we’ve even been to Mars... Signs of life. Zip, zilch, none... Vast empty wastelands... Plenty of ‘em... With no life to be found.