This is the 913th most frequent Korean word.
연구
Research.
In this sentence, '연구' is used to mean 'research', and it refers to academic or scientific investigation into a specific field, in this case, space.
그는 우주 연 구에 관심이 많다.
He is very interested in space research.
Here, '연구' signifies a systematic investigation or study to discover or establish facts, reflecting its use in practical and applied science.
그들은 새로운 약품을 개발하기 위해 연구하고 있다.
They are conducting research to develop new medicines.
In this context, '연구' connects to the laboratory environment related to one doing experimental research or hands-on investigation.