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Life other than Earth


 

Is life possible other than Earth?

We have no idea if life exists somewhere else! We all know that life as we know it requires a unique set of circumstances in order to exist. Many scientists believe that these circumstances exist elsewhere and that life could exist outside of our planet. These species can range from basic bacteria to more complex life forms like plants and animals. All living things require food, water, and the proper environment and temperature. Humans, for example, require oxygen to breathe and can survive in temperatures that are neither too hot nor too cold. Even the power of gravity influences the shape of our body, such as the strength of our bones and muscles.

Because other planets do not have the same conditions as Earth, life on them would be considerably different. These regions, for example, may have a distinct atmosphere, resulting in an insufficient amount of oxygen for us to breathe. All living species on the planet have adapted to our environment, which implies that they all require our particular mix of atmospheric gases. Life in other places would be tailored to their individual needs.

Water is a critical component in maintaining the type of life which we have on Earth. Water is essential for the life of both plants and animals. Planet Earth is unique in that it has a large amount of liquid water. Although we have yet to discover a planet with the same amount of liquid water as Earth, several new "exoplanets" orbiting other stars offer this prospect. One of the things that the Curiosity Mars Rover is seeking is evidence of water on Mars now or in the past. It appears that there was once a lot of liquid water on Mars. On Mars, the conditions could have been ideal for life to thrive. It’s even possible that life began on Mars before spreading to Earth, and that Mars "sowed" life on Earth.

The right temperature is critical for all living organisms. The majority of species on the planet thrive in warm to moderate temperatures. Extremely frigid temperatures, such as those found at the poles and extremely hot settings, such as those found inside volcanoes, are home to fewer biological forms. The distance between a planet and the star it circles - its "sun" – affects the temperature of its atmosphere. Planets closest to the sun are extremely hot, and planets further away are much colder.

 These planets are uninhabitable for humans. We're finding "exoplanets" orbiting other stars that are close enough to have the correct temperature for life to thrive. So, life on other planets, or even moons of other planets, may still exist, but it would most likely be radically different from life on Earth! These other hypothetical forms of life would be extremely remote; therefore they are not a cause for concern.

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