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HW #6 - Lauren Collier 1 What is the evidence that other...

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Lauren Collier 1. What is the evidence that other stars existed before our Sun was formed? The fact that our Sun contains heavy metals is evidence that other stars existed before our Sun was formed. Metals can only be formed inside a star and are scattered throughout the universe when a star explodes. Because our Sun contains some rare metals we know that it used some of the debris to form. 2.What process heated the solar nebula as it slowly condensed toward a central protosun? Mutual gravitational pulls on the different areas of the nebula made the nebula contract and form a central protosun. 3.(a) What is meant by accretion? (b) Why are the terrestrial planets denser at their centers than at their surfaces? Accretion is the accumulation of matter to form larger objects. The terrestrial planets have dense centers because the denser materials, like iron, sunk to the center of the planet while the lighter material stayed on top.
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