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
來源 http://www.nasa.gov/mission_pages/kepler/news/smallest-exoplanets.html
作者 NASA/JPL-Caltech

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Public domain 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/zhNASA版權政策JPL圖像使用政策
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目前2017年4月15日 (六) 20:15於 2017年4月15日 (六) 20:15 版本的縮圖3,000 × 2,000(307 KB)Karl432對話 | 貢獻Making 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) 23:37於 2014年12月2日 (二) 23:37 版本的縮圖3,000 × 2,000(221 KB)Karl432對話 | 貢獻KOI-961 is now known as Kepler-42. Legends adjusted.
2012年8月30日 (四) 20:15於 2012年8月30日 (四) 20:15 版本的縮圖3,000 × 2,000(334 KB)Stas1995對話 | 貢獻User created page with UploadWizard

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