This interstellar "bullet," traveling over three million miles per hour (5 million km), is just catching up with the shock front, which has been slowed by plowing into interstellar material.

这个蓝色的“子弹”每小时飞行500万公里(300万英里)，恰好能赶上激震前沿，此时冲击波因为星际物质的阻挡已经减速。

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Mission managers expect Voyager 1 to leave our solar system and enter interstellar space in the next five years or so, with Voyager 2 on track to enter interstellar space shortly after that.

项目管理者们认为旅行者1号将于未来大约5年内飞离太阳系而进入恒星际空间，而旅行者2号也将在那之后不久进入恒星际空间。

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Collapsing interstellar cloud reverses its gravitational infall and expands outward into the relatively quiescent interstellar environment.

坍缩的星际云克服向内的引力而向外膨胀到较宁静的星际环境中去。

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Even though they account for only about 1% of the mass of a typical interstellar cloud, interstellar dust grains play a crucial role in the creation of this rich variety of molecules and in the process of star formation.

BBC: University of Nottingham

He notes that should produce radiation capable of ionizing the helium contained in the interstellar medium.

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The "Halo" series chronicles an interstellar war between humans and aliens known as the Covenant.

CNN: Web series builds anticipation for 'Halo 4'