File:Kepler-42 System – Jupiter System Comparison.jpg

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English: This artist's concept compares the Kepler-42 (formerly known as KOI-961) planetary system to Jupiter and the largest four of its many moons.

The Kepler-42 planetary system hosts the three smallest planets known to orbit a star beyond our sun (called Kepler-42b, Kepler-42c, Kepler-43d; formerly called KOI-961.01, KOI-961.02 and KOI-961.03). The smallest of these planets, Kepler-42d, is about the same size as Mars. All three planets take less than two days to whip around their star.

The planets were discovered using data from NASA's Kepler mission and ground-based telescopes. The Kepler-42 star is a tiny "red dwarf," just one-sixth the size of our sun. This planetary system is the most compact detected to date, with a scale closer to Jupiter and its moons than another star system.

The planet and moon orbits are drawn to the same scale. The relative sizes of the stars, planets and moons have been increased for visibility.
日期
来源 http://www.nasa.gov/mission_pages/kepler/news/smallest-exoplanets.html
作者 NASA/JPL-Caltech

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Public domain 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/zhNASA版权方针页面JPL图片使用方针。)
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当前2017年4月15日 (六) 20:152017年4月15日 (六) 20:15版本的缩略图3,000 × 2,000(307 KB)Karl432Making the star color a little more similar to the color by what a 3100K black body would appear to the human eye (in fact comparable to a 2800–3100K halogen light bulb)
2014年12月2日 (二) 23:372014年12月2日 (二) 23:37版本的缩略图3,000 × 2,000(221 KB)Karl432KOI-961 is now known as Kepler-42. Legends adjusted.
2012年8月30日 (四) 20:152012年8月30日 (四) 20:15版本的缩略图3,000 × 2,000(334 KB)Stas1995User created page with UploadWizard

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