Physics

Guest

12 November, 22:35

Earth is just one of the planets that revolve around the Sun in the Solar System, and 5

the Sun is just one of billions of stars within the Milky Way Galaxy. The Milky Way is

one of thirty galaxies in a cluster of galaxies called the Local Group. The local group

is just one cluster within a super-cluster called the Virgo Super-Cluster. And finally

the Virgo Super-Cluster is just a tiny part of the entire Universe. Galaxies are systems

of stars, gases, and dust that exist in a wide variery of shapes and sizes. The simplest

classification scheme devised by Edwin Llubble recognizes four basic types of

galaxies: elliptical, spiral, barred spiral, and irregular. Identify the shape of Earth's

galaxy:

A) spiral galaxy

B) lenticular galaxy

C) elliptical galaxy

D) irregular galaxy