尽管它从未被发现，但是通过观察星系的移动轨迹，黑暗物质却是宇宙中83%的构成成分。
Although it has never been seen, dark matter makes up about 83 percent of the matter in the Universe, according to observations of how galaxies move.
随着仪器精度的提高，我们应该可以从这颗行星那里了解到有关其大气和成分的宝贵信息，以此类推，还可以了解到其他恒星系的特性。
As the precision of our instruments improve, we should be able to learn some incredible information about the planet's atmosphere and composition, and, by extension, the nature of other solar systems.
然而尽管撞在一起，由于星系组成成分—恒星之间的遥远距离，构成星系的普通物质彼此通过，并没有碰撞发生。
But although they are colliding, the ordinary matter in the constituent galaxies, due to the vast distances between component stars, pass through each other without incident.
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