Carnil (Star)

Carnil, known as the red star, is actually the planet Mars. The stars were created by Varda, but given that Mars is a planet, she most likely had help from other Valar or perhaps she put down the framework for Eru to finish the planet. It is conceivable that Carnil had actual life on it. Though Tolkien never wrote about Martians, his best friend C.S. Lewis did.