The local group is only one of many, many clusters of galaxies. all of the galaxies are all moving away from each other causing more and more space to come between them. this means the universe is expanding. that discovery is what led to

Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.

B. elliptical. as in oval. 0 (==