ISP 205: Visions of the Universe - Physics & Astronomy
ISP 205: Visions of the Universe - Physics & Astronomy
ISP 205: Visions of the Universe - Physics & Astronomy
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Useful definition: a light-year•The distance light can travel in one year.• About 10 trillion km (6 trillion miles).© 2005 Pearson Education Inc.,publishing as Addison-Wesley