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汉语拼音：xīng jì wù zhì

恒星间密度极稀的物质。包括占90%的气体和10%的尘埃微粒，以及宇宙线和磁场。气体主要由氢、氦组成。尘埃是直径只有几十万分之一厘米的固态质点。平均密度为1个粒子/立方厘米。既是形成恒星的材料，又是恒星演化的产物。

星际物质 [xīng jì wù zhì]

1. 弥漫在恒星之间的物质，包括星际气体、尘埃与宇宙线等。

• If the cloud is visible, we call it a nebula. An example is the Eagle nebula below.

  假若这些星际物质可以看得到，我们便称之为星云，下图是著名的鹰星云

• 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。

• It also means that the comet is not made of small, pristine interstellar materials either.

  这同样也表示彗星不是由少量、原始星际物质构成的。

• these filaments reveal where the shock wave is encountering lower - density , more uniform interstellar material.

  纤维揭示的是激波与更均匀的低密度星际物质相遇的地方。

• Supernovaexplosions also enrich the interstellar medium with new chemical elements, which are incorporated into future generations of stars.

  超新星爆发同时用新的化学元素充实星际物质，并成为下一代恒星的一部分。

• The outer layers of the star crashed into the interstellar medium, driving a shock wave that is still visible today.

  这颗星的外层撞到星际物质，由其产生的冲击波至今仍然可见。

• Today, the Crab Nebula is still expanding and it will eventually dissolve in the interstellar gas cloud nearby.

  蟹状星云仍然在膨胀最终会溶入星际物质而消散。

• A star is formed when a cloud of gas collapses from the interstellar medium toward high density.

  一个气体云自星际物质中坍缩，密度达到很高时，即形成了一个恒星。

• The interstellar material distributes in the astrospace also asymmetry.

  星际物质在宇宙空间的分布并不均匀。