A large blue glowing light that intensified in size and brightness.I witnessed a large blue fireball while outside with my dog. It was an intense blue light that increased in intensity and lit up the ground all around us, like lightning would, but much brighter. It gave me the chills and my dog was barking and seemed very scared and skittish, and ran to my side. The glow increased in size and got brighter and then was gone. Like an explosion in space with no sound, fragmentation or trails.