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Homework 3_Wilson

homework 3

Q Assignment Instructions Research each of the following four topics and submit your answers in a document in .docx (Word) format. 1. Why do nebulae near hot stars look red? Why do dust clouds near stars usually look blue? 2. Describe how the 21-cm line of hydrogen is formed. Why is this line such an important tool for understanding the interstellar medium? 3. Give several reasons the Orion molecular cloud is such a useful “laboratory” for studying the stages of star formation. 4. Explain why we have learned a lot about star formation since the invention of detectors sensitive to infrared radiation. Your submission should be one to two pages, 12-point font, double spaced. Please include your last name in the document filename.

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Nebulae near hot stars look red because radiation is absorbed by nebulae (Guidry, 2019). Therefore, the red color is emitted by nebulae. Dust clouds near stars usually look blue because light gets scattered by the dust grain present in the dust clouds. It is from the star which is nearest that the light gets scattered. The size of the dust clouds and the dust grain makes the dust clouds appear to be blue.