Free-return trajectory

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Notion

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Science and technology

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What Wikipedia says

In orbital mechanics, a free-return trajectory is a trajectory of a spacecraft traveling away from a primary body (for example, the Earth) where gravity due to a secondary body (for example, the Moon) causes the spacecraft to return to the primary body without propulsion (hence the term free).

Excerpt from the Wikipedia article “Free-return trajectory”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NickFr, Public domain, via Wikimedia Commons.