Light echo

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

In collections

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What Wikipedia says

A light echo is a physical phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance.

Excerpt from the Wikipedia article “Light echo”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Arkyan (Arkyan), CC BY-SA 3.0, via Wikimedia Commons.