File:Upsilon Andromedae b.jpg
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[编辑]描述Upsilon Andromedae b.jpg |
This artist's concept shows a Jupiter-like planet soaking up the scorching rays of its nearby "sun." NASA's Spitzer Space Telescope used its heat-seeking infrared eyes to figure out that a gas-giant planet like the one depicted here is two-faced, with one side perpetually in the cold dark, and the other forever blistering under the heat of its star. The illustration portrays how the planet would appear to infrared eyes, showing temperature variations across its surface. The planet, called Upsilon Andromedae b, was first discovered in 1996 around the star Upsilon Andromedae, located 40 light-years away in the constellation Andromeda. This star also has two other planets orbiting farther out. Upsilon Andromedae b is what's known as a "hot-Jupiter" planet, because it is made of gas like our Jovian giant, and it is hot, due to its tight, 4.6-day-long jaunt around its star. The toasty planet orbits at one-sixth the distance of Mercury from our own sun. It travels in a plane that is seen neither edge- nor face-on from our solar system, but somewhere in between. Scientists do not know how fast Upsilon Andromedae b is spinning on its axis, but they believe that it is tidally locked to its star, just as our locked moon forever hides its "dark side" from Earth's view. Spitzer observed Upsilon Andromedae b at five points during the planet's trip around its star. The planet's light levels went up or down, as detected by Spitzer, depending on whether the planet's sunlit or dark side was pointed toward Earth. These data indicate that the temperature difference between the two hemispheres of the planet is about 1,400 degrees Celsius (2,550 degrees Fahrenheit). According to astronomers, this means that the side of the planet that faces the star is always as hot as lava, while the other side could potentially be as cold as ice. Specifically, the hot side of the planet ranges from about 1,400 to 1,650 degrees Celsius (2,550 to 3,000 degrees Fahrenheit), and the cold side from about minus 20 to 230 degrees Celsius (minus 4 to 450 degrees Fahrenheit). How can one side always be hot? The atmosphere of the planet must be absorbing and reradiating light fast enough that any heated gas circulating around the planet is cooled off before it reaches the dark side. |
日期 | 未知日期 |
来源 | http://photojournal.jpl.nasa.gov/catalog/PIA01938 |
作者 | NASA/JPL-Caltech |
许可协议
[编辑]Public domainPublic domainfalsefalse |
本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zh、NASA版权方针页面或JPL图片使用方针。) | ||
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当前 | 2009年12月30日 (三) 20:32 | 2,400 × 3,200(556 KB) | Supportstorm(留言 | 贡献) | Fix | |
2009年12月30日 (三) 20:30 | 2,400 × 3,200(556 KB) | Supportstorm(留言 | 贡献) | Image Adjustment: Auto levels on contrast and color | ||
2007年6月12日 (二) 08:02 | 2,400 × 3,200(301 KB) | Marvin 92(留言 | 贡献) | == Summary == NASA artist rendering of exoplanet, Upsilon Andromedae b. Category:Exoplanets |
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垂直分辨率 | 72 dpi |
使用软件 | Adobe Photoshop 7.0 |
文件修改日期时间 | 2009年12月30日 (三) 14:30 |
色彩空间 | 未标定 |