Fill in the concept map with the following terms: Planetary Systems, Galaxies, Planets, Sun, Venus, Moon, Stars, Sirius, Solar System, Comet, Meteor, Open Clusters, Stellar Regions, Jupiter, Titan, Solar Neighborhood, M80, Upsilon Andromeda.
Imagine the Universe! is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA’s Goddard Space Flight Center.
Source: NASA – Imagine The Universe
Sur: As you can see the mind map above is only fraction of what human know about galaxies in very vast universe.