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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Airborne soot and dirt from the impact blanketed Earth, inhibiting photosynthesis and triggering mass extinction of species.

撞击产生的烟尘和灰尘覆盖了地球，抑制了光合作用，引发了物种的大规模灭绝。

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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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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

Advanced science instruments aboard future spacecraft, such as the proposed European Plato mission, could find many more Earth-mass planets orbiting Sun-like stars.

BBC: Telescope sees smallest exoplanet

They estimate that at least a third of the planet's mass is diamond - the equivalent of three times Earth's mass.

BBC: Oddballs: The strange worlds beyond our Solar System

The geodetic effect is caused by a distortion that the Earth's mass makes in the fabric of space.

ECONOMIST: A new satellite will test Einstein's magnum opus