美國太空總處嘅開普勒任務 發現有成千上萬個類似地球嘅行星 圍繞住其他恆星運行 證明地球只係銀河系 數以千萬宜居行星嘅其中一個
The Kepler mission of the United States Space Administration found thousands of Earth-like planets orbiting other stars, proving that Earth is only one of tens of millions of habitable planets with a galactic coefficient