File:Distant active comet C 2017 K2.jpg
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![File:Distant active comet C 2017 K2.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Distant_active_comet_C_2017_K2.jpg/600px-Distant_active_comet_C_2017_K2.jpg?20191231090904)
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[编辑]描述Distant active comet C 2017 K2.jpg |
English: This Hubble Space Telescope image shows a fuzzy cloud of dust, called a coma, surrounding the comet C/2017 K2 PANSTARRS (K2), the farthest active comet ever observed entering the solar system. Hubble snapped images of K2 when the frozen visitor was over 2.4 billion kilometres from the Sun, just beyond Saturn's orbit. Even at that remote distance, sunlight is warming the frigid comet, producing a 128,000-kilometre-wide coma that envelops a tiny, solid nucleus. K2 has been traveling for millions of years from its home in the Oort Cloud, a spherical region at the edge of our solar system. This frigid area contains hundreds of billions of comets, the icy leftovers from the formation of the solar system 4.6 billion years ago. The image was taken in June 2017 by Hubble's Wide Field Camera 3. Links: NASA Press Release Schematic of comet C/2017 K2's approach to the Solar System |
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来源 | https://www.spacetelescope.org/images/opo1740a/ |
作者 | NASA, ESA, and D. Jewitt (UCLA) |
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ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
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提供者 | NASA, ESA, and D. Jewitt (UCLA) |
来源 | ESA/Hubble |
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数据生成日期时间 | 2017年10月2日 (一) 12:28 |
JPEG文件备注 | This Hubble Space Telescope image shows a fuzzy cloud of dust, called a coma, surrounding the comet C/2017 K2 Pan-STARRS (K2), the farthest active comet ever observed entering the solar system. Hubble snapped images of K2 when the frozen visitor was 1.5 billion miles from the Sun, just beyond Saturn's orbit. Even at that remote distance, sunlight is warming the frigid comet, producing an 80,000-mile-wide coma that envelops a tiny, solid nucleus. K2 has been traveling for millions of years from its home in the Oort Cloud, a spherical region at the edge of our solar system. This frigid area contains at least 100 million comets, the icy leftovers from the formation of the solar system 4.6 billion years ago. During the comet's inward journey, gravitational tugs from the planets nudged it from its trajectory so that it is no longer gravitationally bound to the Sun. After K2 makes its closest approach to the Sun in 2022, it will leave the solar system forever. The image was taken in June 2017 by Hubble's Wide Field Camera 3. |
关键词 | C/2017 K2 PANSTARRS |
联系信息 |
Karl-Schwarzschild-Strasse 2 Garching bei München, None, D-85748 Germany |
IIM版本 | 4 |