Molestan is a form of the verb molestar (to bother). In the song, it's used reflexively: "se molestan" which means "they get annoyed."
In the lyric "Y las estrellas se molestan" (And the stars get annoyed), Aitana uses this word to create a beautiful and memorable image. She's saying her partner looks at her more than the stars, making the stars themselves feel jealous and bothered. This poetic personification is a unique way of expressing how special and loved she feels.
In “Luna,” Spanish pop sensation Aitana turns the night sky into a love story, comparing her partner to a full moon whose glow cuts through years of bad timing, distance, and gossip. The lyrics trace two souls who kept missing each other — "Alguno siempre estuvo acompañado / O tú o yo / Nunca los dos" — until fate finally aligns their orbits. Whenever this lunar love appears, everything feels safe and bright, yet the threat of separation looms like a power outage, making her plead "No te vayas" so she never has to face another dark night alone. The song glimmers with hope, vulnerability, and the magical pull of a light that outshines every star in the sky.