File:Universal gravitational mass.PNG

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DescriptionUniversal gravitational mass.PNG	English: An apple experiences gravitational fields directed towards every part of the Earth; however, the sum total of these many fields produces a single powerful gravitational field directed towards the Earth’s center of gravity.
Date	1 November 2009, 04:58 (UTC)
Source	The Earth seen from Apollo 17 with white background.jpg
Author	The Earth seen from Apollo 17 with white background.jpg: created by NASA derivative work: Unitfreak (talk)
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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: added apples arrows & 2nd earth. The original can be viewed here: The Earth seen from Apollo 17 with white background.jpg: .

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	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.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

Original upload log

This image is a derivative work of the following images:

File:The Earth seen from Apollo 17 with white background.jpg licensed with PD-USGov-NASA
- 2006-03-16T08:08:27Z Lefrancq 2790x2776 (4613084 Bytes) Photo "The_Earth_seen_from_Apollo_17.jpg" on white background. See the original to have a complete description.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	05:03, 1 November 2009		459 × 290 (89 KB)	Unitfreak (talk \| contribs)	{{Information \|Description=== \|Source=File:The_Earth_seen_from_Apollo_17_trsp_back.jpg \|Date=2009-11-01 04:58 (UTC) \|Author=File:The_Earth_seen_from_Apollo_17_trsp_back.jpg: created by NASA *derivative work: ~~~ \|Permission=see b

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- User:Physikerwelt/sandbox/Mass
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- 질량
- 사용자:Ksajinwoo
Usage on tr.wikipedia.org
- Kütle
Usage on zh.wikipedia.org
- 质量

File:Universal gravitational mass.PNG

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inception

1 November 2009