In science, a theory is not just an opinion or a guess; it is a well-supported explanation of a natural phenomenon. A theory, therefore, is the same as a hypothesis.
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Because of Earth’s unique distance from the Sun, the planet is able to contain water in all of its forms: liquid, ice, and gas. (hint: think of what would happen to water in Venus and Mars).
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According to current evidence, the Earth is about 4.5 billion years old, and life here began around 3.8 billion years. It’s possible that future new evidence may show that life on Earth began even earlier.
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Planet Earth is unique because it is within the only known solar system in our galaxy.
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