I almost touched the moon

The male protagonist is a skier and the female protagonist is an astrophysics doctor. The tidal lock between Pluto and its satellite Charon is the only pair in the solar system. In the Kuiper Belt, where almost no sunlight can pass through, Pluto's satellite Charon has been accompanying it on this lonely journey. The cold and quiet ISTP female protagonist vs. the sensitive ISFJ little milk dog female protagonist who just wants to be with her sister. The female protagonist is relatively unkind in the early stage, but she will change in the later stage. Sweet with abuse?? Key point: This novel is purely fictional. The characters, place names, groups, events, professional terms, etc. in the text have nothing to do with the facts! There is no discrimination or dragging and any other negative comments and influences...