Earth Beyond Earth

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Are we really alone? The ultimate question every physicist and possible scientist craves for an answer in his or her lifetime. For life to exists, the basic requirements include the right temperature, water, sunlight, and oxygen. The planets must be made of rock and not gas, big enough to have an inner molten core to generate geothermal energy to protect life from radiation.

Astrobiologists estimate that our Milky Way has about 500 habitable planets which might fit the criteria for life beyond Earth, and yet, nothing has been proven to be as perfect as Earth. Are we that special after all? Would any of these top choices be the next home for humans?