What did Annie Cannon contribute to the understanding of stellar spectra? What is the defining difference between a brown dwarf and a true star?

Assignment

Research each of the following four topics and submit your answers in a .docx (Word) or PDF format:

Explain why color is a measure of a star’s temperature.
What elements are stars mostly made of? How do we know this?
What did Annie Cannon contribute to the understanding of stellar spectra?
What is the defining difference between a brown dwarf and a true star?

What did Annie Cannon contribute to the understanding of stellar spectra? What is the defining difference between a brown dwarf and a true star?
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