This is the 5984th most frequent Korean word.
상상조차
"상상조차" means "even imagining" or "the very act of imagining."
In this sentence, '상상조차' highlights the unlikeliness or unimaginable nature of space exploration becoming a reality.
우리가 우주를 탐험할 날이 올 것이라고는 상상조차 하지 못했어요.
I could not have imagined that a day would come when we explore space.
The word '상상조차' emphasizes the inability to even conceive of the terribleness of the accident.
그 사고가 얼마나 끔찍했는지 상상조차 할 수 없어요.
I cannot even imagine how terrible that accident was.
Here, '상상조차' stresses that the speaker's imagination cannot reach the extent of his talent.