Andromeda Galaxy: nearest neighboring major galaxy to our "Milky Way Galaxy". Due to begin a collision with our Milky Way galaxy in about billion years, Andromeda is million light years away from Earth (at the speed of light).
A Wolf-Rayet Bubble Nebula surrounds a Wolf-Rayet star. There are different types of WR-nebula, based on their formation mechanism: regions nebulae bubbles hydrogen voids and shells (may be assoc. The nebula shown is a 'wind-blown bubbles' type