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File:Orbits of inner moons of Neptune including S 2004 N 1.jpg

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摘要

描述
English: This diagram shows the orbits of several moons located close to the planet Neptune. All of them were discovered in 1989 by NASA's Voyager 2 spacecraft, with the exception of S/2004 N 1, which was discovered in archival Hubble Space Telescope images taken from 2004 to 2009. The moons all follow prograde orbits and are nestled among Neptune's rings (not shown). The outer moon Triton was discovered in 1846 — the same year the planet itself was discovered. Triton's orbit is retrograde, suggesting it is a captured Kuiper Belt object and therefore a distant cousin of Pluto. The inner moons may have formed after Triton's capture several billion years ago.
日期
來源 http://hubblesite.org/newscenter/archive/releases/2013/30/image/e/
作者 NASA, ESA, and A. Feild (STScI)
本圖像或影音收錄於美國國家航空暨太空總署 （NASA）某部門，其照片編號為： STScI-PRC2013-30e

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授權條款

Public domain
This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use.

The material was created for NASA by Space Telescope Science Institute under Contract NAS5-26555, or for ESA by the Hubble European Space Agency Information Centre. Copyright statement at hubblesite.org or 2008 copyright statement at spacetelescope.org.

For material created by the European Space Agency on the spacetelescope.org site since 2009, use the {{ESA-Hubble}} tag.

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取自「https://zh.wikipedia.org/wiki/File:Orbits_of_inner_moons_of_Neptune_including_S_2004_N_1.jpg」