Life maybe possible on other planets, provided some conditions are met. First of all, we have to understand that life could be very different from what we observe on Earth. Other planets may have a different atmosphere and gaseous composition. The planet may or may not have the type of relationship we have with our star (the Sun), in terms of seasonal cycle and solar radiation. The planet may also have more extreme or uniform weather. Under such conditions, life may exist, but could be totally different than Earth's life forms. Unlike the planet is very Earth like, life could be dependent on similar or different sources of food and life processes (such as photosynthesis, cellular respiration, etc.) could be different. There is certainly a possibility of existence of life on other planets, however, they may be so distant, that we will not be able to find them anytime soon.
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