# Homework A - Astronomy 100 Homework A Fall 2008 Jim...

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Astronomy 100 – Homework A Fall 2008: Jim Kaler (Reason for correct answer is in italics ) 1. The Astronomical Unit (AU) is the average distance between a) the Earth's north and south poles b) the Moon and the Earth c) the Sun and Neptune d) the Sun and the Earth e) the Sun and the nearest star 2. What is the length of the AU? a) 13,000 miles b) 300,000 km c) 92 million miles (or 150 million kilometers) d) 1 light minute e) 4 light seconds 3. The radius of the Sun's planetary system out to Neptune in AU is roughly a) 10 b) 20 c) 30 d) 80 e) 160 4. The distance to the nearest star (other than the Sun) in light years is a) 0.4 b) 4 (Alpha Centauri in the deep southern hemisphere) c) 40 d) 400 e) 4000 5. The speed of light in miles per second is a) 18,600 b) 186,000 (300,000 kilometers per second) c) 300,000 d) 30 million e) 30,000 6. The Earth's diameter is roughly a) 8000 kilometers b) 4000 kilometers c) 238,000 miles d) 25,000 miles e) 13,000 kilometers (8000 miles) 7. The Sun's diameter is how many times that of Earth? a) 10,000 b) 1000 c) 100 (860,000 miles, 1.5 million km) d) 10 e) 1 8. The correct order of planets in DECREASING distance from the Sun is a) Mars, Venus, Earth, Mercury b) Mars, Earth, Venus, Mercury c) Venus, Mars, Earth, Mercury d) Mars, Mercury, Venus, Earth

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e) Mercury, Earth, Venus, Mars 9. The correct order of planets in INCREASING distance from the Sun is
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## This note was uploaded on 10/15/2008 for the course ASTRO 100 taught by Professor Kaler during the Spring '08 term at University of Illinois at Urbana–Champaign.

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Homework A - Astronomy 100 Homework A Fall 2008 Jim...

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