The Tardigrade - https://en.wikipedia.org/wiki/Tardigrade
Tardigrades are able to survive in extreme environments that would kill almost any other animal. Extremes at which tardigrades can survive include those of:
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Temperature – tardigrades can survive:
- A few minutes at 151 °C (304 °F)[53]
- 30 years at −20 °C (−4 °F)[54]
- A few days at −200 °C (−328 °F; 73 K)[53]
- A few minutes at −272 °C (−458 °F; 1 K)[55]
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Pressure – they can withstand the extremely low pressure of a vacuum and also very high pressures, more than 1,200 times atmospheric pressure. Tardigrades can survive the vacuum of open space and solar radiation combined for at least 10 days.[56] Some species can also withstand pressure of 6,000 atmospheres, which is nearly six times the pressure of water in the deepest ocean trench, the Mariana Trench.[25]
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Dehydration – the longest that living tardigrades have been shown to survive in a dry state is nearly 10 years,[41][42] although there is one report of leg movement, not generally considered “survival”,[57] in a 120-year-old specimen from dried moss.[58] When exposed to extremely low temperatures, their body composition goes from 85% water to only 3%. As water expands upon freezing, dehydration ensures the tardigrades’ tissues are not ruptured by the expansion of freezing ice.[59]
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Radiation – tardigrades can withstand 1,000 times more radiation than other animals,[60] median lethal doses of 5,000 Gy (of gamma rays) and 6,200 Gy (of heavy ions) in hydrated animals (5 to 10 Gy could be fatal to a human).[61] The only explanation found in earlier experiments for this ability was that their lowered water state provides fewer reactants for ionizing radiation.[61] However, subsequent research found that tardigrades, when hydrated, still remain highly resistant to shortwave UV radiation in comparison to other animals, and that one factor for this is their ability to efficiently repair damage to their DNA resulting from that exposure.[62]
Irradiation of tardigrade eggs collected directly from a natural substrate (moss) showed a clear dose-related response, with a steep decline in hatchability at doses up to 4 kGy, above which no eggs hatched.[63] The eggs were more tolerant to radiation late in development. No eggs irradiated at the early developmental stage hatched, and only one egg at middle stage hatched, while eggs irradiated in the late stage hatched at a rate indistinguishable from controls.[63]
So its obvious that the Tardigrade comes from a time in the Universes early development when the Universe was much warmer and planetary objects were much closer allowing the Tardigrade to quickly transfer ice and water possibly to planets.
When exposed to extremely low temperatures, their body composition goes from 85% water to only 3%. As water expands upon freezing, dehydration ensures the tardigrades’ tissues are not ruptured by the expansion of freezing ice.
If a water bear is injured, she folds herself up and stays still until she recovers, and if conditions are bad — no moisture, maybe — she tucks her head and legs into her body, squeezing out the water inside her, so that she vaguely resembles a microscopic mouse-dropping. In that condition, she can live for many years (some say 100 years), while waiting for improvements. It’s called “cryptobiosis,” meaning “hidden life,” and is something a number of different life forms can do.
If a billion Tardigrade all bunched themselves up and squeezed that water out of their bodies to form a protective shell until conditions got better, it can be assumed that the Tardigrade in large numbers could in fact generate a pool of water large enough for other microbes smaller than they are to live in.
So, at first a ten gallon bucket of Tardigrades moved through the Universe sealed in the frozen cryo-chamber until the cryo-chamber came into contact with other frozen cryo-chambers possibly forming a giant car sized ice chunk traveling through the Universe. As the cry-chamber grew in size and eventually found a water rich planet or even a moon their numbers increased based on the amount of water that was present and other Tardigrades that were consumed and left behind as feces. Feces that provided nutrients for other microbes as well as plants that could have eventually developed into soil that that hosts plant life that is necessary for humans and other life to exist.