There is no life without water

The widespread presence of liquid water on our planet has allowed the implantation and development of vital processes, something that has not been, until now, identified in any other planet.

Life is intrinsically related to water. DNA, the gigantic molecule that forms the basis of all known organisms, requires, for its metabolism and reproduction, to be in contact with an aqueous solution of appropriate characteristics. Most organisms live in water, and those that do not, carry their own aqueous microenvironment with them. In short, in this world, life can not exist without liquid water. Reciprocally, in the places where there is liquid water, the conditions for the development of vital processes are given.

We do not know if there are large volumes of water in liquid state on other planets. Surely there is groundwater ("aquifers") on Mars. Maybe there is water inside the moon. There are strong indications of oceans of water covered by a thick layer frozen in some of the moons of Jupiter (for example, Europe, not to be confused with the continent) and in Enceladus (a moon of Saturn).

Given the low and extreme temperatures and the very low pressure conditions of these satellites, it is unlikely that vital processes can exist on their surfaces, let alone a "biospheric" situation such as exists on Earth. On our planet, ADN life has colonized practically all aquatic environments. There are living organisms in the boiling hydrothermal emanations from the bottom of the oceans, in the drops of water condensed from the tropospheric clouds and in the melting waters of the Antarctic and Greenlandic inlands. Even in the driest regions, where atmospheric humidity never exceeds 20 or 30%, such as certain areas of the Sahara in Africa or the Rub 'al Khali in Arabia, there are many forms of life adapted to this situation (eg plants. phreatophytes, invertebrates, reptiles, mammals, varied microorganisms).. These organisms  "transport" their aqueous solutions protected from external membranes, shells, skins, crusts or other insulating materials. This generalized vital olonization of the liquid aqueous medium makes it difficult to differentiate water from life. Hence we can affirm that, on Earth, and probably throughout the universe, liquid water and life constitute are inseparable.