The Earth is not alone, scientists have discovered two "extrasolar brothers"-the Earth, extrasolar planets-IT information
According to the United Kingdom daily mail reported in May of this year, astronomers found a planetary system in 40 light-years from Earth, 3 Earth-sized extrasolar planets orbit a star. At present, the astronomers have evidence that two planets have the best nourishment for extraterrestrial life environment.
Astronomers of Hubble space telescope data, found that the innermost planet is a rock structure, like the Earth, is wrapped in a dense atmosphere. Following the discovery of the planetary system, United States analysis of scientists at MIT which 3 planets the size and temperature, so as to judge their suitability for life.
3 newly discovered extrasolar planet around a super cold brown dwarfs, this volume is only one-eighth of the Sun, known as "Trappist-1". Astronomers have discovered every time, the star's light Dim slightly, suggesting that planets exist across its surface.
Further research teams using the Hubble Space Telescope observation, record these 3 each across the surface of the planet. Planetary system the most medial of the two planets rotation period is 1.5 and 2.4 days, 3rd planet's rotation period is between 4-73 days.
Belgium Liege University Michael-Kuala Lumpur (Michael Gillon) and colleagues looked at different wavelength range, which 3 planets pass in front of the light intensity changes. Along with the wavelength changes, significant changes in transit Ray, suggesting the transiting planet with fuzzy similar to Jupiter's atmosphere. Research results show that the innermost planets transit Ray stabilize, this indicates that the two planets have dense atmosphere, that rocky planets similar to the Earth, Venus and Mars's atmosphere.
Study leader Julian DeWitt (Julien de Wit), says we can infer that the two planets are Rocky planets, but there is one question is, what kind of atmosphere they have? Probably they atmosphere close to the atmosphere, primarily composed of carbon dioxide, or the distribution of the Earth's atmosphere with thick clouds, or there is a thin atmosphere like Mars. Next we will try to reveal the atmosphere characteristic of Rocky planets may exist.
地球不孤单，科学家发现两个“系外兄弟” - 地球,系外行星 - IT资讯
据英国每日邮报报道，今年5月份，天文学家发现距离地球40光年处存在一个行星系统，3颗地球大小的系外行星环绕一颗恒星运行。目前，天文学家有证据表明，其中两颗行星拥有孕育外星生命的最佳环境。
天文学家通过哈勃太空望远镜观测数据，发现最内侧的行星是岩石结构，像地球一样，被密集大气层包裹着。发现这个行星系统之后，美国麻省理工学院的科学家评估分析了这3颗行星的体积大小和温度，从而分析判断它们是否适宜生命存活。
最新发现的3颗系外行星环绕一颗超寒冷褐矮星，该恒星体积仅是太阳的八分之一，被称为“Trappist-1”。天文学家观测发现每隔一定时间，这颗恒星光线亮度轻微变暗，暗示着存在几颗行星掠过它的表面。
研究小组使用哈勃太空望远镜进一步观测，记录了这3颗行星每次掠过恒星表面的状况。行星系统最内侧的两颗行星自转周期分别为1.5和2.4天，而第3颗行星的自转周期在4-73天之间。
比利时列日大学迈克尔-吉隆(Michael Gillon)和同事观察了在不同波长范围内，这3颗行星掠过恒星前方产生的恒星光线亮度变化。如果伴随着波长变化，凌日光线出现显著改变，则暗示着这颗凌日行星具有类似木星的模糊大气层。研究结果表明，最内侧两颗行星凌日光线趋于稳定，这表明两颗行星具有紧密大气层，类似于地球、金星和火星这样岩石行星的大气层。
研究报告负责人朱利安-德维特(Julien de Wit)博士称，目前我们可以推断这两颗行星是岩石行星，但存在一个问题是，它们拥有怎样的大气层？很可能它们的大气层接近于金星大气层，主要成分是二氧化碳，或者像地球大气层一样分布着浓密云层，也可能像火星一样存在着稀薄的大气层。下一步我们将试着揭晓这些岩石行星可能存在的大气层特征。