回复：【ISAP天文社科普】地球的兄弟，另一个地球？

While Kepler-452b is larger than Earth, its 385-day orbit is only 5 percent longer. The planet is 5 percent farther from its parent star Kepler-452 than Earth is from the Sun. Kepler-452 is 6 billion years old, 1.5 billion years older than our sun, has the same temperature, and is 20 percent brighter and has a diameter 10 percent larger.
尽管Kepler-425b尺寸大于地球，其385天的公转周期只比地球大5%。另外它到其母恒星Kepler-452的距离比日地距大5%。恒星Kepler-452的年龄为60亿年，即比太阳早15亿年诞生，与太阳温度相近，比太阳亮20%，直径大10%。
看清楚了，公转周期385天

“We can think of Kepler-452b as an older, bigger cousin to Earth, providing an opportunity to understand and reflect upon Earth’s evolving environment," said Jon Jenkins, Kepler data analysis lead at NASA's Ames Research Center in Moffett Field, California, who led the team that discovered Kepler-452b. "It’s awe-inspiring to consider that this planet has spent 6 billion years in the habitable zone of its star; longer than Earth. That’s substantial opportunity for life to arise, should all the necessary ingredients and conditions for life exist on this planet.”
“我们可以想象Kepler-452b是地球更老、更大的堂哥，因此它能够提供一个理解和反映地球环境演化的机会，”NASA位于加州莫菲特场的埃姆斯研究中心的开普勒数据分析带头人，同时也是发现这颗行星的团队的领导者Jon Jenkins说：“这颗行星已经在宜居带运行了60亿年，这一点令人极为振奋——比地球时间更长，这样生命必需的原材料和生成条件就足以具备，就有更充足的机会生发出生命。”

To help confirm the finding and better determine the properties of the Kepler-452 system, the team conducted ground-based observations at the University of Texas at Austin's McDonald Observatory, the Fred Lawrence Whipple Observatory on Mt. Hopkins, Arizona, and the W. M. Keck Observatory atop Mauna Kea in Hawaii. These measurements were key for the researchers to confirm the planetary nature of Kepler-452b, to refine the size and brightness of its host star and to better pin down the size of the planet and its orbit.
为了确认发现，并能更好地了解Kepler-452星系的组成，小组利用地基望远镜（包括德克萨斯大学的Austin's McDonald天文台，亚利桑那州霍普金斯山的Fred Lawrence Whipple天文台和夏威夷莫纳齐亚的W.M.Keck天文台）进行了进一步观测。这些测量是研究者确认Kepler-452b行星性质、修正母恒星的尺寸和亮度，以及更好地确定行星尺寸和轨道的关键。

The Kepler-452 system is located 1,400 light-years away in the constellation Cygnus. The research paper reporting this finding has been accepted for publication in The Astronomical Journal.
Kepler-452恒星系距地球1400光年，位于天鹅座。关于它和这次发现的研究论文将在AJ（《天文学期刊》）上发表。

In addition to confirming Kepler-452b, the Kepler team has increased the number of new exoplanet candidates by 521 from their analysis of observations conducted from May 2009 to May 2013, raising the number of planet candidates detected by the Kepler mission to 4,696. Candidates require follow-up observations and analysis to verify they are actual planets.
为进一步确认Kepler-452b这样的行星，开普勒小组在2009年5月到13年5月间，已经分析了521个系外行星候选者，这使得开普勒任务发现的行星候选者总数增长到了4696个。这些候选者需要跟进观测和分析，以确定它们是否确实是行星。