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**HELP ASAP PLEASE!**

How can astronomers determine a star’s chemical composition?

A.by looking at its temperature

B.by using a spectrograph

C.by comparing its size to the sun

D.by comparing its color to the sun

Respuesta :

Spongebobking
They use a spectrograph so the answer would be B.
I think, according to Neil DeGrasse Tyson's Cosmos, that it would be either A. or B. That should eliminate the answers that I am pretty sure don't make sense. Though I am pretty sure it should be A...... 

P.S. You should watch Cosmos! It's pretty good!

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