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Title: Thorium Emission Lamp
Description: A thorium emission lamp's violet glow, when viewed through a spectroscope (metal tube on right in top image), is split into a spectrum of thousands of bright lines (bottom image). New measurements of these lines could help astronomers search for earthlike planets around distant stars.

-PML

See also http://www.nist.gov/pml/div684/thorium-032614.cfm.
Subjects (names):
Topics/Categories:
Type: Photo/Color
Source: National Institute of Standards and Technology
Credit Line as it should
appear in print:
Credit: NIST
AV Number: 14PML012
Date Created: Unknown
Date Entered: 3/26/2014

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