This is the 10748th most frequent Korean word.
궤도선을
"궤도선을" means "orbit line" or "orbital trajectory" in English.
Here, '궤도선을' (orbital vehicle) is used as a direct object of the verb ‘발사했습니다’ (launched).
궤도선을 지구 주위로 발사했습니다.
The orbital vehicle was launched around the Earth.
In this sentence, '궤도선을' refers to the entity being developed, functioning as the object of '개발하기' (to develop).
궤도선을 개발하기 위해 많은 기술적 도전이 필요했습니다.
To develop the orbital vehicle, many technical challenges were required.
Here, '궤도선을' is used as the direct object of the verb '설계하여' (designed).