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alb8345828

The star Algol, in the constellation Perseus, seems to vary in luminosity. In fact, it is a double star in which the brighter of the pair is periodically occulted by its darker companion, which explains why the brightness of the main star seems to drop at regular intervals.

The star Algol, in the constellation Perseus, seems to vary in luminosity. In fact, it is a double star in which the brighter of the pair is periodically occulted by its darker companion, which explains why the brightness of the main star seems to drop at regular intervals.
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Caption:
The star Algol, in the constellation Perseus, seems to vary in luminosity. In fact, it is a double star in which the brighter of the pair is periodically occulted by its darker companion, which explains why the brightness of the main star seems to drop at regular intervals.
Credit:
Album / Universal Images Group
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Image size:
1828 x 3000 px | 15.7 MB
Print size:
15.5 x 25.4 cm | 6.1 x 10.0 in (300 dpi)
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