Actually, "Jean" (in the comics, the Jean that had the Phoenix in the Phoenix & Dark Phoenix sagas was a clone created by the Phoenix, which comic fans refer to as Phoenix II, the real Jean is referred to as Phoenix IV) killed herself; she controlled a cannon through telekinesis to fire at her. In the bastardization in the X-Men Animated Series, Jean holds off the Phoenix and brings the Shi'ar weapons online, letting them kill her.
And rages, Galactus is pretty much a God himself. He survived the collapse of the universe billions of years ago before it was reborn (into today's universe) in the Big Bang. He has unlimited control of the Power Cosmic and eats entire worlds as though they were nothing. He wasn't even phased by the Phoenix Force's barrage and mocked it afterward (and revealed the truth behind the Phoenix).