The Cosmic Landscape
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| The radius of the sun is 7x10^5 kilometers, and that of the Earth is about 6.4x10^3 kilometers. Use scientific notation to show that the Sun's radius is about 100 times the Earth's radius. | The Sun’s radius is 10^10 the Earth’s radius. | |
| Given that an astronomical unit... | 1013/1.5X108=66,666.66 AU in a light-year | |
| Calculate approximately how long... | Pluto is approximately 39.5 AU (p. 54) from the Sun. 1.5x108X39.5=5.925X109 |
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