Sideral translates to "sidereal" or "of the stars", and it is most commonly paired with the word "espacio" to mean deep, outer space.
In this whimsical track, the singer wants to take her love to "el espacio sideral" to express a romantic feeling that is truly out of this world. It is a poetic, astronomical term that perfectly captures the magical, gravity-defying sensation of falling in love.
Have you ever liked someone so much that you wanted to hand them the entire universe? That is the exact brand of goofy, sweet daydreaming Mexican duo Jesse & Joy lean into here. Joy sings about wanting to gather up the stars in a glass box ("en una caja de cristal") or serve the Milky Way in a breakfast bowl: "Regalarte la vía láctea / En un plato de cereal" (Gift you the Milky Way / In a cereal bowl). She dreams of turning into a full-blown comic book superhero to fight off bad guys and fly across outer space ("al espacio sideral") just like Superman.
Then the reality check hits, and it is adorable. As soon as her crush actually walks into the room, all those imaginary powers vanish completely: "Todas mis fuerzas se me van si estas aquí / Y mis poderes no son nada" (All my strength leaves me if you are here / And my powers are nothing). The presence of this person acts like kryptonite, stripping away the superhero fantasy and leaving her feeling completely human: "tan normal, tan frágil, tan real" (so normal, so fragile, so real). Instead of saving the day, she is just utterly in love ("tan enamorada"), waiting for the other person to lift her off the ground.