Beta Lyrae variable

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What Wikipedia says

Beta Lyrae variables are a class of close binary stars. Their total brightness is variable because the two component stars orbit each other, and in this orbit one component periodically passes in front of the other one, thereby blocking its light.

Excerpt from the Wikipedia article “Beta Lyrae variable”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Merikanto, CC BY-SA 4.0, via Wikimedia Commons.