I would like to share this segment of prose written by Kate Wilhelm, one of my favourite writers. The part I marked bold is what I think one of the most beautiful lines written in a Sci-Fi story:

… he asked, "Don't you even care?"
"Care?"
Ben heard the pain there, sharp, undeniable. He closed his eyes hard.
"Should I weep and howl and tear my clothes, and bang my head on the wall? Should I beg you not to leave me, to stay with me always? Should I throw myself from the topmost window of this house? Should I grow thin and pale and wither away like flower in the autumn, killed by the cold it never understands? How should I show you I care, Ben? Tell me what to do."
He felt her hand on his cheek and opened his eyes and found they were burning.
"Come with me, Ben," she said gently. "And afterwards perhaps we shall weep together when we say good-bye"

From "Where Late the Sweet Birds Sing" (1974)