The cosmic perfect cosmic bubble, due to the gas produced by a heavy star. Official name NGC 7635, The Bubble Nebula in Simple Language The magnitude of the expanding bubbles is going to increase today, whose diameter is 10 light years. The center of its center is the octane star. The brightness of which is several hundred times the Sun and it is about 45 times. These cosmic bubbles have heavy densities of densities. This Bubbub's location is 11000 light-years away from Earth, in the Cassiopeia terracotta.
From @emamuddin