... Simulated Galaxy Cluster View . ... A large, elliptical galaxy dominates this hypothetical cluster's central region surrounded by a swarm of member galaxies. ... Oceans appear blue not only because water itself is blue but also because seawater frequently scatters light from a blue sky. ... Jupiter s Great X Ray Spot . ... In the right hand panel above, the familiar giant planet with storm system and cloud bands is shown in an optical image from the passing Cassini spacecraft. ...