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A spectrograph is a machine that attaches to a telescope and shows starlight in a spectrum. Astronomers can look at a star's light spectrum and tell how far away it is and if it is moving further away over time.
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School subscriptions can access more than 175 downloadable unit bundles in our store for free (a value of $1,500).
District subscriptions provide huge group discounts for their schools. Email for a quote: sheri@exploringnature.org.
