A thorium emissin lamp's violet glow, when viewed through a spectroscope, is split into a spectrum of thousands of bright lines. New measurements of these lines could help astronomers search for earthlike planets around distant stars.

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A thorium emissin lamp's violet glow, when viewed through a spectroscope, is split into a spectrum of thousands of bright lines. New measurements of these lines could help astronomers search for earthlike planets around distant stars.
A thorium emissin lamp's violet glow, when viewed through a spectroscope, is split into a spectrum of thousands of bright lines.  New measurements of these lines could help astronomers search for earthlike planets around distant stars.

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