This is the 13946th most frequent Korean word.
망원경으로
"With a telescope" or "using a telescope."
망원경으로 is used to indicate the tool ('telescope') through which the action ('observing') is performed.
그는 망원경으로 밤하늘의 별을 관찰했다.
He observed the stars in the night sky using a telescope.
망원경으로 here describes the method ('using a telescope') employed to enjoy the view of the mountains.
아이들은 망원경으로 멀리 떨어진 산의 경치를 감상했다.
The children admired the scenery of distant mountains using a telescope.
망원경으로 is used to characterize the instrument ('telescope') employed by the scientists in their search for extraterrestrial life.