Elliptical galaxies contain many older stars, up to one trillion, but little dust and other interstellar matter.
椭圆星系中有多达万亿颗古老的恒星，但几乎没有灰尘和其他星际物质。
Using recent experimental results, we calculate the antiproton flux which is produced by the collisions of cosmic rays with the interstellar matter.
利用最近的实验结果，计算了宇宙线与星际物质碰撞产生的反质子流强。
We observe in the galaxy much larger, denser, and more massive aggregates of cold interstellar matter.
在银河系中还观测到大小，密度和质量都要大得多的冷星际物质团。
We observe in the galaxy much larger, denser, and more massive aggregates of cold interstellar matter.
在银河系中还观测到大小，密度和质量都要大得多的冷星际物质团。
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