... M100: A Grand Design . ... Credit Copyright: NASA Explanation: Majestic on a truly cosmic scale, M100 is appropriately known as a Grand Design spiral galaxy . A large galaxy of over 100 billion or so stars with well defined spiral arms , it is similar to our own Milky Way . One of the brightest members of the Virgo Cluster of galaxies , M100 (alias NGC 4321) is 56 million light-years distant in the spring constellation of Coma Berenices . ... Publications with keywords: M 100 - spiral galaxy . ...