nm (mi-) [u-/i-] tension, struggle.
(nm means nomino, noun)
From Swahili.it / Swahili-English Dictionary
[Part of Speech] noun
[Swahili Example] katika jaribio la kupunguza mvutano uliopo na Uchina waziri mkuu wa Japan Junichiro Koizumi amesema nchi yake inakabiliana na ukweli huo wa kihistoria kwa unyenyekevu
[English Example] in an effort to reduce tension in China, the Japanese Prime Minister Junichiro Koizumi has said that his country is facing these facts of history with humility
(I think there is a typo, *Japani)
From Academic: http://swahili_english.enacademic.com/10246/mvutano
Grawity is a good answer because gravity means - a pull ( synonym ). Between the planets is exactly - gravity. :)
Tension between planets? That makes no sense physically. Tension is an internal force in a rigid or elastic body. Between planets you would have gravity, but not tension, unless the planets are tied together with a rope or cable.