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Year light - PowerPoint PPT Presentation

The Universe within 500 million light years of Earth (in the center)

The Universe within 500 million light years of Earth (in the center). A light year is a unit of distance It is the distance that light can travel in one sidereal year Light moves at a velocity of about 300,000 kilometers each second

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Year light - PowerPoint PPT Presentation

The Universe within 500 million light years of Earth (in the center)