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Celestial Album
Close-up of L1544


Close-up of L1544 with the water spectrum seen by Herschel, taken from the centre of the pre-stellar core. The peak of the graph shows an excess in brightness, or emission, while the trough shows a deficit, or absorption. These characteristics are used to indicate the density and motions of the water molecules within the cloud. Credit: ESA/Herschel/SPIRE/HIFI/Caselli et al.

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