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What do spectrographs do? How do you use a spectrograph? A spectrograph is used for what? What other astronomers help Hubble? What are the uses of a spectrograph? How does the mass spectrograph help? Why do astronomers use a spectrograph? How do anstronomers use a spectrograph? A spectrograph can tell a scientist what? What does a spectrograph tell us about stars? What is the change in color in a spectrograph? What do spectrographs help astronomers determine? How do astronomers determine if a star has planets? How do astronomers use a spectrograph to study stars? What information do scientists get from a spectrograph? A spectrograph helps astronomers to determine a star's? What is is called when the color changes on a spectrograph? How can a spectrograph tell scientists what a star is made of? What type of electromagnetic radition does a spectrograph examine? What is the information recorded by a spectrograph used to identify?