Why is Water Essential for Life on Earth?

Without water, there is no life on earth. Life almost certainly started from water. From pregnancy to childbirth, the child is in a gentle state in the water (amniotic fluid) bag, protecting the fetus from physical harm and buffering. After giving a child 90% of breast milk, the birth of a child is predicted by "breaking down water" (Nagin, 2008). Water definition Pure water is colorless, transparent, odorless, tasteless liquid. It can exist in three physical states, solid (ice), liquid and gas (vapor).

As seawater covers 71% of the earth's surface, the earth is the only planet known to have stable liquids on its surface, and liquid water is indispensable for all known life forms on Earth is. Although the origin of the earth's water is not yet known, the existence of water on the surface of the earth is a product of its atmospheric pressure and a stable orbit of the habitable zone around the sun. The main methods currently used for verification are absorption spectroscopy and geochemistry. These technologies have been proven to be effective for atmospheric water vapor and ice. However, using current astronomical spectroscopy, it is much more difficult to detect liquid water on the planet on Earth, especially in the case of groundwater. Therefore, astronomers, astrophysics, and planetary scientists use the livable area, gravity and tide theory, planetary differences, and radiometric models to determine the possibility of liquid water.

Residential areas, orbital areas around stars, planets on the earth can have liquid water on their surface and can support life. Since liquid water is essential to all life on earth, the definition of the area that can live is based on the assumption that extraterrestrial life shares this requirement. This is a very conservative (but observable) definition. Because the surface temperature of the planet is not only close to a fixed star, but also it depends on its atmospheric greenhouse gas, its reflectivity, and the atmospheric or oceanic circulation. In addition, internal energy sources such as radioactive decay and tidal heating can warm the surface of the earth to the melting point of water. Because these energy sources also maintain groundwater reservoirs, planets can contain life even if they are not in the area where those stars can live.