File:Moon Chandra Optical.jpg

From Wikiversity
Jump to navigation Jump to search

Original file(3,150 × 1,685 pixels, file size: 344 KB, MIME type: image/jpeg)

Commons-logo.svg This is a file from the Wikimedia Commons. The description on its description page there is shown below.

Commons is a freely licensed media file repository. You can help.

Summary

Description
English: The Chandra observations (right) of the bright portion of the Moon detected X-rays from oxygen, magnesium, aluminum and silicon atoms. The X-rays are produced by fluorescence when solar X-rays bombard the Moon's surface. Chandra's observations have also solved a decade-long mystery about X-rays detected by ROSAT that were thought to be coming from the dark portion of the Moon. It turns out that these X-rays only appear to come from the Moon. Chandra shows that the X-rays from the dark moon can be explained by radiation from Earth's geocorona (extended outer atmosphere) through which orbiting spacecraft move.
Date
Source CHANDRA X-ray Observatory CXC Operated for NASA by SAO, url=http://chandra.harvard.edu/photo/2003/moon/index.html
Author Optical: Robert Gendler; X-ray: NASA/CXC/SAO/J.Drake et al.
Permission
(Reusing this file)

Images from NASA usually are free of copyright.

The geocoronal X-rays are caused by collisions of heavy ions of carbon, oxygen and neon in the solar wind with hydrogen atoms located tens of thousands of miles above the surface of Earth. During the collisions, the solar ions capture electrons from hydrogen atoms. The solar ions then kick out X-rays as the captured electrons drop to lower energy states. Chandra image radius is about 17 arcmin. Observation date: July 26, 2001. Instrument: ACIS.

Licensing

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.)
NASA logo.svg
Dialog-warning.svg
Warnings:

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current06:41, 7 May 2015Thumbnail for version as of 06:41, 7 May 20153,150 × 1,685 (344 KB)Jcpag2012full resolution
22:59, 25 November 2009Thumbnail for version as of 22:59, 25 November 2009420 × 224 (12 KB)Marshallsumter{{Information |Description={{en|1=The Chandra observations (right) of the bright portion of the Moon detected X-rays from oxygen, magnesium, aluminum and silicon atoms. The X-rays are produced by fluorescence when solar X-rays bombard the Moon's surface.

Metadata