Talaksan:Proteus (Voyager 2).jpg

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English: Proteus is the second largest moon of Neptune behind the mysterious Triton. Proteus was discovered only in 1989 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.

Original NASA caption: This image of Neptune's satellite 1989N1 was obtained on Aug. 25, 1989 from a range of 146,000 kilometers (91,000 miles). The resolution is about 2.7 kilometers (1.7 miles) per line pair.

The satellite, seen here about half illuminated, has an average radius of some 200 kilometers (120 miles). It is dark (albedo 6 percent) and spectrally grey. Hints of crater-like forms and groove-like lineations can be discerned. The apparent graininess of the image is caused by the short exposure necessary to avoid significant smear.
Deutsch: Proteus ist hinter dem geheimnisvollen Triton der zweitgrößte Mond des Neptuns. Proteus wurde erst 1989 durch das Voyager 2 Raumschiff entdeckt. Das ist ungewöhnlich, da Neptun einen kleineren Mond - Nereid - hat, der schon 33 Jahre früher von der Erde aus entdeckt wurde. Der Grund für Proteus' späte Entdeckung war seine sehr dunkle Oberfläche. Auch seine Umlaufbahn ist viel näher bei Neptun als die von Nereid. Proteus hat eine ungewöhnliche kastenartige Form und wäre er nur wenig masserreicher, würde ihn seine eigene Schwerkraft in eine Kugel umformen.
Petsa
Pinanggalingan 1989N1 Surface Detail (PIA00062)
May-akda Voyager 2, NASA
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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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Image extraction processThis file has an extracted image: Proteus Voyager 2 croped.jpg.
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This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA00062.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.
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Proteus, second-largest moon of Neptune

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25 Agosto 1989

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ngayon20:54, 1 Enero 2010Thumbnail para sa bersyon noong 20:54, 1 Enero 2010836 × 840 (64 KB)SupportstormFix
20:54, 1 Enero 2010Thumbnail para sa bersyon noong 20:54, 1 Enero 2010836 × 840 (64 KB)SupportstormImage Adjustments: Auto levels on contrast and color
05:48, 11 Hunyo 2006Thumbnail para sa bersyon noong 05:48, 11 Hunyo 2006836 × 840 (41 KB)Konstable~commonswiki
13:45, 11 Abril 2006Thumbnail para sa bersyon noong 13:45, 11 Abril 2006836 × 840 (48 KB)Argo Navis== 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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