将下面这篇文章中的所有冠词替换成“the”。
下面这篇文章的原始文本：

“Astronomy is a science that studies celestial objects, such as planets, stars, and galaxies. It encompasses many distinct areas, such as astrophysics, planetary science, and cosmology. An astronomer observes objects in the night sky using telescopes and other scientific instruments.”
"The" astronomy is "the" science that studies "the" celestial objects, such as "the" planets, "the" stars, and "the" galaxies. It encompasses many distinct areas, such as astrophysics, planetary science, and cosmology. "The" astronomer observes objects in "the" night sky using telescopes and other scientific instruments.