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。

youdao

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。

youdao

Its mass is about 55 times the mass of Earth.

它的质量大约是地球质量的55倍。

youdao

Other is gravitational mass, which is the measure of how much you're attracted to the Earth.

另一个是引力质量,它可以用来衡量地球对物体引力的大小

耶鲁公开课 - 基础物理课程节选

You cannot tell the mass, because what you are doing now is appealing to the notion of mass as something that's related to the pull of the Earth on the object.

你无法测出质量,因为你现在所做的是把质量,用地球对物体的引力给替代了

耶鲁公开课 - 基础物理课程节选

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