With a diameter just 12 per cent bigger than Earth, Kepler-438b has a 70 per cent chance of being rocky, the scientists have calculated.
科学家估计,直径只比地球长12%的Kepler-438b有岩石的几率是70%。
Kepler-442b is about one-third larger than Earth, and the likelihood of it being rocky is around 60 per cent.
Kepler-442b只比地球大三分之一,有岩石的几率约是60%。
To be in the habitable zone, also known as the 'Goldilocks zone', a planet must be not too hot or too cold and receive roughly as much sunlight as Earth.
如果一个行星处在可居住带内,就必然不太热或不太冷,还会像地球一样受到充沛阳光的照射。
Too much heat from its star, and any water would boil away as steam. Too little, and the water would freeze solid.
如果行星从恒星那里得到过多热量,行星上的任何水都会像蒸汽一样蒸发。如果得到的热量太少,水就会冻成固体。
'For our calculations we chose to adopt the broadest possible limits that can plausibly lead to suitable conditions for life,' Dr Torres added.
托雷斯表示:“为了计算,我们选择使用了似乎都可以导致适和生命存在条件的最广泛的限制标准。”
Kepler-438b receives about 40 per cent more light than the Earth giving it a 70 per cent probability of having a habitable zone orbit. In comparison, baking hot Venus has twice as much.
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