Analysing the way the planetary wobbles affect light coming from the star makes it possible to calculate their mass.
KOI-314c's companion world is similar to it in size but weighs four times more than the Earth.
The new discovery was made by chance as scientists scoured data from the Kepler space telescope looking for evidence of moons rather than planets.
'When we noticed this planet showed transit timing variations, the signature was clearly due to the other planet in the system and not a moon,' said Dr Kipping.
'At first we were disappointed it wasn't a moon, but then we soon realised it was an extraordinary measurement.'
据英国《每日邮报》报道,科学家发现在距离地球200光年的地方有一颗与地球质量相同的神秘行星。
尽管科学家认为在银河系中五分之一的恒星都有一个与地球相似的行星围绕其运行,但是天文学家们却从未找到另外一个与地球真正相似的世界。
不过,研究者们最近离这一目标又近了一步,在距离地球200光年的外星系中发现了地球的“双胞胎”。
这颗被称为“KOI-314c”的行星,质量与地球相当,但是体积比地球大60%。科学家怀疑这是因为它的大气层更厚。
这颗行星围绕一颗暗红色的小行星近距离运行,因此其表面温度高达104摄氏度,这个温度对于地球上的大部分生物来说都太高。
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