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Gas Giant Planet May Sport Cometlike Tail

Whaddya get when you cross a planet with a comet? Well, HD 209458 b looks like a candidate. It's a gas giant planet also called Osiris, and it's orbiting so close to its star that some of its atmosphere gets blown away by the stellar wind. Astronomers think that it may then have a tail like a comet's.

哪天你看到一顆貌似彗星的行星，那會(huì)是啥星呢？嗯，有可能是HD 209458 b哦。它是顆氣態(tài)大行星，也叫“歐西里斯”星。它的運(yùn)行軌跡過于接近其恒星，致使它的部分大氣層被恒星吹起。天文學(xué)家們認(rèn)為這樣一來，這顆行星就像彗星一樣有了一條尾巴。

The researchers studied the odd object using the Hubble Space Telescope and reported their finding in the July 10th issue of The Astrophysical Journal. [Jeffrey Linsky et al., S]

研究人員用哈勃太空望遠(yuǎn)鏡觀測(cè)了這顆奇特星球，并且將他們的發(fā)現(xiàn)發(fā)表在了《天文物理期刊》7月10日大事記中。

The planet is about 153 light-years from Earth, and weighs a bit less than Jupiter. But its zippy orbit is a hundred times closer to its star than Jupiter's is.

這顆行星距離地球約153光年，略輕于土星。不過它的運(yùn)行軌道與其恒星之間的距離要比土星與其恒星之間的距離近100倍。

Astronomers got information about the planet by observing its effect on its star's light when it moved in front of the star from our point of view. They found that most of the gas being driven away from the planet by its star was moving at 22,000 miles per hour. But don't worry about the planet disappearing entirely any time soon. The current best estimate to complete the vaporization: a trillion years.

天文學(xué)家通過觀測(cè)當(dāng)它運(yùn)行到觀測(cè)點(diǎn)與其恒星之間時(shí)對(duì)恒星的光的影響發(fā)現(xiàn)，這顆行星上大部分被其恒星吹起的氣體的流速達(dá)到了每小時(shí)22000英里。不過，我們大可不必?fù)?dān)心這顆星球很快就會(huì)消失，據(jù)目前最準(zhǔn)確的估計(jì)，這顆行星完全蒸發(fā)得花1萬億年的時(shí)間。

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