The Hubble Space Telescope has been on its extended sightseeing tour now for 21 years. It has, in the words of Nasa Administrator Charles Bolden, "profoundly changed our view of the universe, allowing us to see deep into the past while opening our eyes to the majesty and wonders around us". To celbrate its 21st birthday, Nasa turned Hubble to view this stunning pair of galaxies, 300 million light years away. The large spiral galaxy above is being distorted by the tidal pull of the galaxy below. But never mind the science - Nasa thought it made a beautiful rose shape, suitable for a birthday gift. Happy birthday Hubble!