File:Venus xray 420.jpg
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[編輯]描述Venus xray 420.jpg |
English: This Chandra image, the first X-ray image ever made of Venus, shows a half crescent due to the relative orientation of the Sun, Earth and Venus. The X-rays from Venus are produced by fluorescent radiation from oxygen and other atoms in the atmosphere between 120 and 140 kilometers above the surface of the planet. In contrast, the optical light from Venus is caused by the reflection from clouds 50 to 70 kilometers above the surface.
Solar X-rays bombard the atmosphere of Venus, knock electrons out of the inner parts of atoms, and excite the atoms to a higher energy level. The atoms almost immediately return to their lower energy state with the emission of a fluorescent X-ray. A similar process involving ultraviolet light produces the visible light from fluorescent lamps. |
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來源 | CHANDRA X-ray Observatory CXC Operated for NASA by SAO, url=http://chandra.harvard.edu/photo/2001/venus/ |
作者 | NASA/MPE/K.Dennerl et al. |
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Images from NASA usually are free of copyright. |
Image is 2.25 arcmin across. Observation dates: January 10 & 13, 2001. Instrument: LETG.
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[編輯]Public domainPublic domainfalsefalse |
本作品由NASA創作,屬於公有領域。根據NASA的版權政策:“NASA的創作除非另有聲明否則不受版權保護。”(參見:Template:PD-USGov/zh,NASA版權政策或JPL圖像使用政策) | ||
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目前 | 2009年11月25日 (三) 19:27 | 420 × 370(10 KB) | Marshallsumter(留言 | 貢獻) | {{Information |Description={{en|1=This Chandra image, the first X-ray image ever made of Venus, shows a half crescent due to the relative orientation of the Sun, Earth and Venus. The X-rays from Venus are produced by fluorescent radiation from oxygen and |
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