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SlideshowReport

Reflection Nebulae

Description
The Universe

Distances to the stars are very large
Units of measurement
Kilometers or astronomical units are too cumbersome to use
Light-year is used most often
Distance that light travels in 1 year
One light-year is 9.5 trillion kilometers (5.8 trillion miles)
Other methods for measuring distance are also used

Interstellar Matter  

Between the stars is “the vacuum of space”
Nebula
Cloud of dust and gases
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