Basics of Astronomy Worksheet

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University of Phoenix Material Basics of Astronomy Worksheet * * Complete the table based on the readings for this week: Ch. 1–4 of The Essential Cosmic Perspective. ------------------------------------------------- Term or concept | Definition and explanation | * The Universe * 1. What is Earth’s Sun, and what is its role in the solar system? 2. What is the Milky Way galaxy and the sun’s position in it? 3. What is the Big Bang, and what does it say about the age of the universe? 4. What is meant by the phase “looking out in the universe is looking back in time?” | 1. The sun is a star at the center of our solar system and its light and energy makes it possible for life on earth. 2. The Milky Way galaxy is the galaxy in which our solar system lies. It consists of four major arms and the sun is located in the Orion arm. 3. The Big Bang is the birth of the expansion of the universe and it is about 14 billion years old. 4. This phrase means that the object that is being viewed is being viewed from that point in which the light hit the object. The object you are viewing had to take time for that light being emitted for it to reach us here on earth. | * Location in the Universe * 5. What is Earth’s place in the solar system? 6. How close are the nearest stars to the Sun as compared to the distance between the Sun and the Earth? 7. How large is the Milky Way galaxy? 8. How many stars are estimated to exist in this galaxy? 9. How old is the earth compared to the universe itself? | 5. The earth is the 3rd planet from the Sun. 6. The closest star to the Sun was thought to be Alpha Centauri but Alpha Centauri is a system of three stars Centauri A, Centauri B, and Proxima Centauri. Proxima Centauri is the closest. It is about 4.24 light years away. In comparison it would be about 8 light minutes. 7.

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