Question 12 of 21 Map Sapling Learning macmillan learning The Horsehead Nebula i

Question

Question 12 of 21 Map Sapling Learning macmillan learning The Horsehead Nebula is one of the most recognizable dark nebulae in the sky. Why is it dark? O It is a cloud of gas and dust around a black O It is a cloud that emits dark energy rather o Itis a dense cloud of gas and dust that than electromagnetic radiation. absorbs visible light. It is a cloud that is so cold that it emits no electromagnetic radiation Horsehead Nebula The Horsehead Nebula in Orion is an example of a dark nebula. For more information about this image, go to Resources: Help With This Topic. (ESO)

Explanation / Answer

12. Question: The horsehead nebula is one of the most recognisable dark nebulae in the sky. Why is it dark?

Answer: [C]. It is a dense cloud of gas and dust that absorbs visible light.

Explanation: Horsehead nebula is composed mainly of hydrogen gas and high levels of dust. Basically dust is atoms and small molecules, this dust can absorb light and reddens light as it gets through. That is why horsehead nebula is visible as the black identation to the red emission nebula.

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