宇宙充塞著沙粒大小的流星体。

Meteoroids are small particles in space with size similar to grains of sand.

当流星体进入大气层，它压缩的空气在前面的。

When a meteoroid enters the atmosphere, it compresses the air in front of it.

宇航服的外层能够防御太阳辐射和高速微流星体造成的伤害。 微流星体是指太空中的微小尘粒。

The outer layers of space suit protect against harmful radiation from the Sun and bullet-fast particles of space dust called micrometeoroids.

宇航服的外层能够防御太阳辐射和高速微流星体造成的伤害。 微流星体是指太空中的微小尘粒。

L The outer layers of space suit protect against harmful radiation from the Sun and bullet-fast particles of space dust called micrometeoroids.

流星体闯入地球的大气层（变成流星之前）时，由于高速飞行，它的前端与空气强烈摩擦发热。

When a meteoroid enters the atmosphere of the earth (becoming a meteor), it is actually the speed compressing the air in front of the object that causes it to heat up.

1998年狮子座流星雨来自两股不同组成的流星体颗粒的不均匀混合流。

The data suggest that 1998 Leonid stream was an inhomogeneous mixture of two parts of meteoroids with different grain compositions.

低地球轨道上的航天器易受到微流星体及空间碎片的超高速撞击，导致其严重的损伤甚至灾难性的失效。

All spacecrafts in low orbit are subject to hypervelocity impacts of meteoroids and space debris, which can in turn lead to its significant damage and catastrophic failure.

低地球轨道上的航天器易受到微流星体及空间碎片的超高速撞击，导致其严重的损伤甚至灾难性的失效。

All spacecraft in low orbit are subjected to hypervelocity impacts by meteoroids and space debris, which can lead to significant damage and catastrophic failure.

最近木星陨撃可能来自一巨大流星体。

Recent Jovian impact probably came from a giant meteorite.

流星体在快速穿过大气层时，因磨擦而迅速加热。

The gas can be cooled by a heat exchanger after the air heater.