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单词 Exosolar planets
释义

Exosolar planets

中文百科

太阳系外行星 Exoplanet

(重定向自Exosolar planets)
2013年1月2日:天文学家估计银河系可能包含多达4,000亿颗系外行星,这几乎是每一颗恒星都有一颗行星[1][2][3]。
艺术家显示在银河系内的恒星有行星环绕着是多么普通的现象[4]。
太阳系与巨蟹座55行星系统的比较图。
内太阳系和系外行星HD 179949 b、HD 164427 b、Epsilon Reticuli ab、及Mu Arae b轨道的比较图。(所有母星皆在中央位置)

太阳系外行星系外行星,指在太阳系之外的行星。截至2016年2月22日,已经被认定的系外行星总数为2085颗,这些行星分属1331个行星系,其中有509个多行星系。克卜勒任务已经检测到18,000颗行星候选者,包括262颗位于潜在适居带的候选者。

在银河系,估计有数十亿颗行星(若每颗恒星都至少有一颗行星,将导致有1,000亿至4,000亿颗行星),不只在恒星周围有行星,也有自由移动的行星质量天体,而已知最靠近的系外行星是半人马座αBb。

几乎所有已经发现的系外行星都在我们自己的银河系内,但是有少量的银河系外行星可能可以被检测出来。哈佛-史密松天体物理中心在2013年1月提出的一份报告中提到:估计在银河系内「至少有170亿颗」地球尺度的系外行星。

英语百科

Exoplanet 太阳系外行星

(重定向自Exosolar planets)
Artist's view gives an impression of how commonly planets orbit the stars in the Milky Way.[1]
Size comparison of Jupiter and the exoplanet TrES-3b. TrES-3b has an orbital period of only 31 hours[2]  and is classified as a Hot Jupiter for being large and close to its star, making it one of the easiest planets to detect by the transit method.
The three known planets of the star HR8799, as imaged by the Hale Telescope. The light from the central star was blanked out by a vector vortex coronagraph.2MASS J044144 is a brown dwarf with a companion about 5–10 times the mass of Jupiter. It is not clear whether this companion object is a sub-brown dwarf or a planet.Coronagraphic image of AB Pictoris showing a companion (bottom left), which is either a brown dwarf or a massive planet. The data was obtained on 16 March 2003 with NACO on the VLT, using a 1.4 arcsec occulting mask on top of AB Pictoris.

An exoplanet or extrasolar planet is a planet that orbits a star other than the Sun. Over 2000 exoplanets have been discovered since 1988 (more specifically, 2108 planets in 1350 planetary systems, including 511 multiple planetary systems, have been confirmed, as of 20 April 2016).

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更新时间:2025/6/22 9:14:57