Mysterious form of the fog Soty

The Milky Way has a galaxy satellite the Big Magellanic Cloud. In him at distance of 160 thousand light years from us the colourful fog Tarantul which is a zone of intensive star formation and is very colourful is located. But in her region there is smaller fog Soty. She has drawn to herself attention to those that gas and dust in her have the unusual form of bubbles (on a photo from Hubble it is visible below at the left). 

 Long time experts guessed, than such unusual form different from habitual structures of such fogs is caused. After the analysis of data scientists have come to a conclusion that the form of bubbles is caused by effect of explosion of two supernew. They have exploded with a small interval therefore the wave from one explosion was imposed on a wave from the second, as has created such bizzare shape of a fog. 

Source