The bow shock-wave - very high subsonic flight, just below the speed of sound. Some surfaces of the aircraft are already supersonic - there is local supersonic flow. The mass condensation occurs in the low pressure area directly behind the bow shock-wave.
NGC 3190 is a spiral galaxy with tightly wound arms and lying in the constellation Leo. It was discovered by William Herschel in NGC 3190 is member of Hickson 44 galaxy group, estimated at around 80 million light years and consisting of four
Messier is a spiral galaxy just over 35 million light-years away in the constellation of Leo. This carefully enhanced picture portrays a galactic maelstrom of vivid and vibrant colors. by ESA/Hubble/NASA and the LEGUS Team