Explain how emission lines and absorption lines are formed. In what sorts of cosmic objects would you expect to see each?

Chapter 5: https://openstax.org/books/astronomy/pages/5-thinking-ahead
***Please just use the textbook source
**Answer the questions in a separate document — give full and complete answers to the questions
1. What is a wave? Use the terms wavelength and frequency in your definition.
2. Explain how emission lines and absorption lines are formed. In what sorts of cosmic objects would you expect to see each?
3.Explain why light is referred to as electromagnetic radiation.
4.Explain how we can deduce the temperature of a star by determining its color.
5.Explain how we use spectral absorption and emission lines to determine the composition of a gas.

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