| 太阳系外行星大小是木星两倍 |
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| 作者姓名： | Irene Brown |
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| 摘 要： | After two years of painstaking(艰苦的)research,scientists have determinedthe precise size of a planet beyond oursolar system by measuring tiny shifts in the flit of light comingfrom its parent star.The team studied tiny variations in the tilt of light comingfrom a small star called Gliese 876,which iS about one-thirdthe size of our sun and about 15 light years away.Astronomersalready had determined that at least two planets are orbiting(绕轨道飞行)around the star,though they could not say specifi-cally how large the objects were.The new findings show that the more distant planet isbetween 1.89 and 2.4 times the size of Jupiter.Previous es-timates ranged from 1.9 to 100 times the mass of Jupiter.The technique.called astrometry(天体测定),has beenaround for decades,but has never before been used to deter-
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Extrasolar Planet Twice as Big as Jupiter |
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| Irene Brown.Extrasolar Planet Twice as Big as Jupiter[J].Overseas English,2003(7):19. |
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| Authors: | Irene Brown |
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| Abstract: | After two years of painstaking(艰苦的)research, scientists have determined the precise size of a planet beyond our solar system by measuring tiny shifts in the tilt of light coming from its parent star. |
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