※ 引述《Shuoger (修葛爾)》之銘言： : 整理一下Kepler-452b的小檔案： : 特殊意義：適居帶中首顆尺寸接近地球且繞行類日恆星的行星。 : "Kepler-452b is the first near-Earth-Size planet : in the habitable zone of a star very similar to the sun." : Kepler-452b : ◎ 所在位置：天鵝座，距太陽系約1,400光年處 : ◎ 體積：約較地球大60% : ◎ 質量：未知 : ◎ 組成物質：未知 : ◎ 分類：超級地球 : ◎ 繞行恆星：Kepler-452 : ◎ 公轉週期：385日 : ◎ 軌道半長軸：1.05 AU (天文單位，即地球與太陽的平均距離) : ◎ 恆星光譜：G2 (與太陽同為黃色恆星，也具有相似的溫度與質量) : ◎ 恆星年齡：約60億歲，(較太陽年長15億歲) : 其餘亮點： : 1. 依據先前的研究，像Kepler-452b這樣尺寸的行星有相當可能具有岩石地表(類地行星) : "previous research suggests that planets the size of Kepler-452b : have a better than even chance of being rocky." : 2. Kepler-452b從恆星所接收的能量略高於地球從太陽所接收的10%。 : "Today Kepler-452b is receiving 10 percent more energy from its parent star : than the Earth is from the Sun." : 3. 推測質量可能是地球的5倍。(現場是說2倍) : "However, since it is 60 percent bigger than Earth, it is likely to be : approximately five Earth masses, ..." : Jon Jenkins: "Kepler 452B is around twice the mass of Earth." : 4. 表面可能擁有液態水、活躍的火山以及行光合作用的植物。 : "Kepler could also have liquid water, active volcanoes and photosynthesising : plants on its surface." : 以上。 : 出處： : 1. Kepler-452b: Earth's Bigger, Older Cousin -- Briefing Materials : http://www.nasa.gov/keplerbriefing0723 : 2. Nasa announcement live: New Earth planet could be announced after discovery : by Kepler Telescope : http://www.independent.co.uk/news/sci...-space-telescope-10410960.html