The Bubble Nebula is NGC 7635. The picture is taken using Hydrogen-Alpha light emission. The Bubble Nebula is being pushed out by the solar wind from the large central star BD+602522. There is another bubble nebula known as Thor's Helmet, NGC 2359. The stellar wind originates in a star that is probably ten to twenty times more massive than our Sun. The Bubble Nebula can be seen with a small telescope looking towards the constellation of Cassiopeaia.