Messier 100 (also known as NGC 4321) was discovered by Pierre Méchain on March 15, 1781 and was subsequently entered in Messier's catalogue of nebulae and star clusters after Charles Messier made observations of his own on April 13, 1781. Read more
Messier 100 is a perfect example of a grand design spiral galaxy, a type of galaxy with prominent and very well-defined spiral arms. These dusty structures swirl around the galaxys nucleus, and are marked by a flurry of star formation activity that dots Messier 100 with bright blue, high-mass stars. Read more