Rossiter–McLaughlin effect

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Notion

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Science and technology

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What Wikipedia says

The Rossiter–McLaughlin effect is a spectroscopic phenomenon observed when an object moves across the face of a rotating star. The star is seen to undergo a redshift anomaly caused by the obscuration of different parts of its disk.

Excerpt from the Wikipedia article “Rossiter–McLaughlin effect”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Autiwa derivative work: Autiwa (talk), CC BY 2.5, via Wikimedia Commons.