Image: Hubble eyes an emitting galaxy | 10/28/2019 | Staff
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Credit: ESA/Hubble & NASA, D. Rosario et al.

For this image, the NASA/ESA Hubble Space Telescope turned its powerful eye toward an emission-line galaxy called NGC 3749.

Astronomers - Contents - Parts - Galaxy - Universe

When astronomers explore the contents and constituent parts of a galaxy somewhere in the universe, they use various techniques and tools. One of these is to spread out the incoming light from that galaxy into a spectrum and explore its properties. This is done in much the same way as a glass prism spreads white light into its constituent wavelengths to create a rainbow. By hunting for specific signs of emission from various elements within a galaxy's spectrum of light —so-called emission lines—or, conversely, the signs of absorption from other elements—so-called absorption lines—astronomers can start to deduce what might be happening within.

If a galaxy's spectrum shows many absorption lines and few emission lines,...
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