原标题：太阳系外还有别的“地球”吗？天文学家找到百年前答案的新线索 小黑板 系外行星：所有围绕太阳以外恒星运转的行星都叫做（太阳）系外行星。 白矮星：一种体积远小于我们的太阳、跟地球差不多大的恒星。几乎所有正常恒星最后都会变成白矮星，对于我们的太阳，这种变化将会发生在50亿年之后...
The original title: outside the solar system and other "earth"? Astronomers have found hundreds of years ago the answer new clues Chalkboard exoplanets: all planets orbiting stars beyond the sun called exoplanets (the sun). A White Dwarf, a volume is far less than our sun, with star about the size of the earth. Almost all normal finally will become a White Dwarf stars, for our sun, this change will happen after 5 billion years...
