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Reflection Nebulae
Reflection nebulae are illuminated by nearby stars, not by themselves. They are the brightest by newly formed stars, and often outshines the newly formed stars.
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Emission Nebulae
When the gases within the nebula are heated to ionization by a nearby star, the nebula emits its own light.
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Absorption Nebulae
All light that tries to pass through absorption nebulae is absorbed.
They are difficult to observe unless they are against a very bright background.
The Different Types of Nebulas in the Universe
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