Wavelength of 486.1 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing?

From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 485.9 nm. What can we conclude? A The star is getting hotter. B The... show more From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 485.9 nm. What can we conclude?


A The star is getting hotter.
B The star is getting colder.
C The "star" actually is a planet.
D The star is moving toward us.
E The star is moving away from us.
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