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This story was originally published by NASA and is unaltered.
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Hubble Examines a Barred Spiral’s Light [1]

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Date: 2024-06

Astronomers use filters extensively in their observations. These filters may allow either extremely narrow or somewhat broader ranges of light through to the telescope’s instruments. Narrow-band filters are invaluable from a scientific perspective because they filter specific wavelengths of light that are associated with specific physical and chemical processes. For example, under certain conditions, hydrogen atoms emit red light with a wavelength value of 656.46 nanometers called H-alpha emission, or the ‘H-alpha line’. It is very useful to astronomers because its presence indicates certain physical processes and conditions and is often a tell-tale sign of newly forming stars.

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[1] Url: https://science.nasa.gov/missions/hubble/hubble-examines-a-barred-spirals-light/

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