Six years of observations revealed the presence of five planets between 13 and 25 times the mass of Earth.

经过长达六年的观测，发现有五颗行星的质量是地球的13-25倍。

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The exoplanet is a few times the mass of Earth, but it should still be small enough to be rocky rather than a gas giant like Jupiter.

这个系外行星的质量是地球的几倍，但是它足够小，能够由岩石构成，而不是像木星是一团巨大的气体。

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Its mass is about 55 times the mass of Earth.

它的质量大约是地球质量的55倍。

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It has five times the mass of the Earth and orbits its star every 13 days.

ECONOMIST: Is there anybody out there?

They say they have strong evidence for another planet in the same system that has about eight times the mass of the Earth and orbits every 84 days.

ECONOMIST: Is there anybody out there?

Dr Marcy suspects that his new discovery, which has about 45 times the mass of the Earth, is composed of a rocky core surrounded by a thick envelope of hydrogen and helium gas.

ECONOMIST: Extrasolar planets