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19 de sept. de 2022 · Earth is about 4.5 billion years old. Scientists think that by 4.3 billion years ago, Earth may have developed conditions suitable to support life. The oldest known fossils, however, are only 3.7 billion years old.
Most notably, Earth is unique in that most of our planet is covered in liquid water, since the temperature allows liquid water to exist for extended periods of time. Earth's vast oceans provided a convenient place for life to begin about 3.8 billion years ago.
Although scientists cannot directly address how life on Earth arose, they can formulate and test hypotheses about natural processes that could account for various intermediate steps, consistent with the geological evidence.
16 de oct. de 2023 · ESSAY. 16 October 2023. How would we know whether there is life on Earth? This bold experiment found out. Thirty years ago, astronomer Carl Sagan convinced NASA to turn a passing space probe’s...
30 de abr. de 2024 · Earth is the planet we live on, the third of eight planets in our solar system and the only known place in the universe to support life.
(anonymous) Gaia hypothesis. The Gaia hypothesis, also known as Gaia theory or Gaia principle, proposes that all organisms and their inorganic surroundings on Earth are closely integrated to form a single and self-regulating complex system, maintaining the conditions for life on the planet.
Most notably, Earth is unique in that most of our planet is covered in liquid water, since the temperature allows liquid water to exist for extended periods of time. Earth's vast oceans provided a convenient place for life to begin about 3.8 billion years ago.
