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What makes life on earth possible?

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The newfound alien planet Alpha Centauri Bb is the closest yet found and Earth-size but likely doesn't host alien life. So why is ... Here's what makes life able to thrive on our home planet (and likely for alien life to arise on other worlds): ... We want to learn about what gray areas might exist for possible life.". read more

The sun: provides heat and light needed to support life. Magnetic field: deflects the solar wind. Ozone layer: Acts as a barrier against ultraviolet light and other radiation. read more

Earth remains the only known planet to host life, due to a unique combination of factors. However, continued monitoring of alien worlds might one day change that, by finding other planets that share these attributes or by discovering other ways that life has found to blossom in the universe. read more

Earth has a breathable atmosphere. Oxygen is the gas that is required for the life of most creatures.Earth has a suitable temperature.Earth has water.All planets receive light from the Sun, but no planet uses it as usefully as Earth.Earth's solid inner core and liquid outer core play crucial roles in protecting life from deadly solar radiation. read more

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