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画像:Proteus (Voyager 2).jpg - Wikipedia

画像:Proteus (Voyager 2).jpg

出典: フリー百科事典『ウィキペディア(Wikipedia)』

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ウィキメディア・コモンズの記述

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Description

Voyater 2 photo, 1989 August 25

Proteus is the second largest moon of Neptune behind the mysterious Triton. Proteus was discovered only in 1982 by the Voyager 2 spacecraft. This is unusual since Neptune has a smaller moon - Nereid - which was discovered 33 years earlier from Earth. The reason Proteus was not discovered sooner is that its surface is very dark and it orbits much closer to Neptune. Proteus has an odd box-like shape and were it even slightly more massive, its own gravity would cause it to reform itself into a sphere.

Source

http://www.nasa.gov/

Date

1989-09-25

Author

Voyager 2, NASA

Permission
(Reusing this image)
Public domain
This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy).

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日付/時刻解像度利用者コメント
現在の版2006年6月11日 (日) 05:48836×840 (41 キロバイト)Konstable
2006年4月11日 (火) 13:45836×840 (48 キロバイト)Ante Perkovic (== Summary == Voyater 2 photo, 1989 August 25 '''Description from NASA''' Proteus is the second largest moon of Neptune behind the mysterious Triton. Proteus was discovered only in 1982 by the Voyager 2 spacecraft. This is unusual since Neptune has a sm)

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