Chapter 1 - Phys 107 Dr. Hauck Chapter 1 Homework 4. When...

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Phys 107 Dr. Hauck Chapter 1 Homework 4. When Carl Sagan said that we are “star stuff,” he meant that most of the material from which we and our planet are made was created inside stars that died before the birth of our sun. 5. The speed of light is 300,000 kilometers per second. A light-year is the distance that light can travel in one year, which is about 9.46 trillion kilometers. 11. An astronomical unit, or AU, is the Earth’s average orbital distance. An ecliptic plane is a flat plane that is defined by the Earth’s orbital path. The axis tilt is the amount by which a planet’s axis is tilted with respect to a line perpendicular to the ecliptic plane. 15. The statement does not make sense because a galaxy is composed of at least a few hundred million stars and our solar system only contains one star, the Sun. 16. The statement does not make sense because a light year is a unit of distance not time. 17. The statement does not make sense because a light year is a unit of distance not time.
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Chapter 1 - Phys 107 Dr. Hauck Chapter 1 Homework 4. When...

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