Rather, they are dark because of interstellar dust that hides the stars behind it. 相反,它们之所以是黑暗的,是因为星际尘埃将恒星隐藏在它的后面。
Optical astronomy is most directly affected, for although interstellar gas is perfectly transparent, the dust is not. 光学天文学受到最直接的影响,因为虽然星际气体是完全透明的,但尘埃却不是。
interstellar的重要知识点
interstellar adj. [only before noun] happening or existing between the stars 星际的
Voyager 1 became the first human-made object to cross the heliopause and enter interstellar space. “旅行者1号”成为首个穿过日球层顶并进入星际空间的人造物体。
Current chemical rocket technology is far too slow to make interstellar travel practical within a human lifetime. 目前的化学火箭技术太慢,无法在人的寿命内实现实际的星际旅行。
Scientists are exploring the use of high-powered lasers for more efficient interstellar communications. 科学家们正在探索使用高功率激光器来实现更高效的星际通讯。