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Red dwarfs have one advantage over other stars as abodes for life: far greater longevity. It took 4.5 billion years before humanity appeared on Earth, and life as we know it will see suitable conditions for 1 [95] to 2.3 [96] billion years more. Red dwarfs, by contrast, could live for trillions of years because their nuclear reactions are far ...
The Gaia hypothesis (/ ˈ ɡ aɪ. ə /), also known as the Gaia theory, Gaia paradigm, or the Gaia principle, proposes that living organisms interact with their inorganic surroundings on Earth to form a synergistic and self-regulating complex system that helps to maintain and perpetuate the conditions for life on the planet.
Planetary habitability in the Solar System is the study that searches the possible existence of past or present extraterrestrial life in those celestial bodies. As exoplanets are too far away and can only be studied by indirect means, the celestial bodies in the Solar System allow for a much more detailed study: direct telescope observation, space probes, rovers and even human spaceflight.
Getting an answer to what the atmosphere looks like is vital because it would reveal if the planet can maintain temperatures suitable for liquid water - and possibly life - to exist on its surface.
Once conditions become more suitable for life of the introduced species, the importation of microbial life could begin. [13] As conditions approach that of Earth, plant life could also be brought in. This would accelerate the production of oxygen, which theoretically would make the planet eventually able to support animal life.
The optimum surface temperature for Earth-like life is unknown, although it appears that on Earth, organism diversity has been greater in warmer periods. [52] It is therefore possible that exoplanets with slightly higher average temperatures than that of Earth are more suitable for life. [53]
Nickelback may be part of the reason we have life on Earth. Now, the researchers weren’t just super into late-90s Canadian hard rock—there’s a scientific reason behind the moniker.
To support an Earth-like atmosphere for about 4.6 billion years (Earth's current age), a moon with a Mars-like density is estimated to need at least 7% of Earth's mass. [20] One way to decrease loss from sputtering is for the moon to have a strong magnetic field of its own that can deflect stellar wind and radiation belts.