Come learn 2000+ kanji and 6000+ vocabulary words with WaniKani.
To Dissolve, To Thaw
intransitive verb, ichidan verb
溶かす is "to melt something" and that makes 溶ける to melt (where something just melts, and you're not doing the melting).
The reading comes from 溶かす.
Imagine that the glittering stars are all melting into the night sky.