宇宙质量 meaning in Chinese

mass of the universe

These particles amount to 4 to 5 percent of the mass - energy of the universe [ see box on page 45 ]
这些粒子共占了宇宙质能的4 ~ 5 % （参见61页盘点宇宙质量）。
The stars make up less than 1 percent of its mass ; all the loose gas and other forms of ordinary matter , less than 5 percent
所有恒星的质量加起来不到宇宙质量的1 % ；所有的稀疏气体和其他形式的普通物质，则不到5 % 。