Scientists find X-ray 'Tsunami' twice the size of Milky Way
Scientists have found a vast wave of hot gas in the nearby Perseus galaxy cluster spanning about 2 lakh light-years, twice the size of the Milky Way galaxy.  These Tsunami-like waves are giant versions of Kelvin-Helmholtz waves, which show up wherever there's a velocity difference across the interface between two fluids, such as wind blowing over water, scientists said.