... other beings. After that we will have some kind of idea of the possibilities of extraterrestrial life elsewhere. Long ago, before our planet earth existed, our solar system was a spherical cloud of gas and dust, and as wide as a light year (9.5 trillion kilometers across). The cloud was dense and started to ... denser to its perpendicular axis. That would explain why the spherical cloud turned into a pancake shape, and why the sun is in the middle of the solar system. (McDonough1) As the sun grew bigger and more dense, it had a gravity effect that started to make separate clouds. These ...

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• Grade Level: High School