The researchers needed such telescopes to effectively observe the orbital motion of the black hole's star.

研究人员需要这样的望远镜来有效地观察黑洞的恒星的轨道运动。

Visual binaries are important, because, if you observe them long enough you might be able to see their orbital motion.

目视双星很重要，因为，如果你观察它们的时间足够长，你也许能看到它们的轨道运动。

Images taken a few years apart actually show the planet in different positions around the star, confirming its orbital motion.

相隔几年拍摄的照片实际上显示了这颗行星在恒星周围的不同位置，证实了它的公转运动。

The Earth plows into the meteoroids, so facing the direction of Earth's orbital motion means more meteors, just like you get more raindrops on the front windshield of your car than than on the back when driving through a storm.

地球会撞上流星群，所以面对地球公转运动的方向就意味着有更多的流星，就比如你开车穿过风暴时，你的汽车前挡风玻璃上的雨滴会比后面的多。