The star that exploded that year was just on the edge of the theoretical mass limit for forming black holes, about 20 times the mass of the sun.

爆炸的恒星其质量接近形成黑洞的理论质量极限，即太阳质量的20倍左右。

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With in-source collision induced dissociation (CID) and exact mass measurement, the differences between the calculated mass and the theoretical mass of all compounds and fragments were less than 2.

对经过液相色谱分离后的化合物进行源内碰撞诱导裂解(CID)，并对化合物及其碎片离子进行精确质量测定，测定质量与理论质量之间误差不超过2。

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The next one, unless everyone’s theories are wrong, will be the Higgs boson, a theoretical construct required to give mass to the other particles of which matter is composed.

除非现有的粒子物理理论是错误的，下一个待发现的将是希格斯波色子(Higgs boson)，它的理论作用是把质量赋给其他物质组成粒子。

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An amateur economist, he created a theoretical model which allegedly proved that mass starvation was an inevitable result of population growth.

FORBES: Malthus and Scrooge: How Charles Dickens Put Holly Branch Through The Heart Of The Worst Economics Ever

In the 1960s, a small number of theorists plugged that gap by dreaming up Higgs, which provides a theoretical explanation for how some particles could attain mass.

WSJ: New Particle Found, Consistent With Higgs Boson

"When you have such a big mass in such a small space you have extremely high gravity, " said Charles Wang, a theoretical physicist at the University of Aberdeen, Scotland, who wasn't involved in the study.

WSJ: Einstein Proved Right on Gravity��Again