File:Earth_and_Super-Earth.jpg
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![File:Earth and Super-Earth.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Earth_and_Super-Earth.jpg/800px-Earth_and_Super-Earth.jpg)
原始文件 (4,000 × 2,400像素,文件大小:567 KB,MIME类型:image/jpeg)
摘要
描述Earth and Super-Earth.jpg |
English: This artists concept contrasts our familiar Earth with the exceptionally strange planet known as 55 Cancri e. While it is only about twice the size of the Earth, NASA's Spitzer Space Telescope has gathered surprising new details about this supersized and superheated world.
Astronomers first discovered 55 Cancri e in 2004, and continued investigation of the exoplanet has shown it to be a truly bizarre place. The world revolves around its sun-like star in the shortest time period of all known exoplanets just 17 hours and 40 minutes. (In other words, a year on 55 Cancri e lasts less than 18 hours.) The exoplanet orbits about 26 times closer to its star than Mercury, the most Sun-kissed planet in our solar system. Such proximity means that 55 Cancri e's surface roasts at a minimum of 3,200 degrees Fahrenheit (1,760 degrees Celsius). The new observations with Spitzer reveal 55 Cancri e to have a mass 7.8 times and a radius just over twice that of Earth. Those properties place 55 Cancri e in the "super-Earth" class of exoplanets, a few dozen of which have been found. However, what makes this world so remarkable is the resulting low density derived from these measurements. The Spitzer results suggest that about a fifth of the planet's mass must be made of light elements and compounds, including water. In the intense heat of 55 Cancri e's terribly close sun, those light materials would exist in a "supercritical" state, between that of a liquid and a gas, and might sizzle out of the planet's surface. Only a handful of known super-Earths, however, cross the face of their stars as viewed from our vantage point in the cosmos. At just 40 light years away, 55 Cancri e stands as the smallest transiting super-Earth in our stellar neighborhood. In fact, 55 Cancri is so bright and close that it can be seen with the naked eye on a clear, dark night. |
日期 | |
来源 | http://planetquest.jpl.nasa.gov/image/15 |
作者 | NASA/JPL-Caltech/R. Hurt (SSC) |
许可协议
Public domainPublic domainfalsefalse |
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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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26 9 2011
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图像标题 |
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简短标题 |
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提供者 | NASA/JPL-Caltech/R. Hurt (SSC) |
图像内容提要 | This artists concept contrasts our familiar Earth with the exceptionally strange planet known as 55 Cancri e. While it is only about twice the size of the Earth, NASA's Spitzer Space Telescope has gathered surprising new details about this supersized and superheated world. |
来源 | Spitzer Space Telescope |
数据生成日期时间 | 2011年9月26日 (星期一) |
宽度 | 4,000 px |
高度 | 2,400 px |
每色彩组分位数 |
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压缩方案 | LZW |
像素构成 | RGB |
方向 | 正常 |
色彩组分数 | 3 |
水平分辨率 | 300 dpi |
垂直分辨率 | 300 dpi |
数据排布 | 大块格式 |
使用软件 | Adobe Photoshop CS3 Macintosh |
文件修改日期时间 | 2011年9月26日 (一) 13:20 |
色彩空间 | sRGB |
联系信息 |
-{R|http://www.spitzer.caltech.edu}- 1200 E. California Blvd. Pasadena, CA, 91125 USA |
关键词 | 55 Cancri e |