The rotation curve of the Milky Way Galaxy shows what the the orbital speed of the farthest gas clouds from the galactic center (located in the outer regions of the Galaxy) , indicating a great deal of mass beyond the Sun’s orbit.

within these regions are all the major types of biomes in the world. a biome is a community of animals and plants spreading over an extensive area with a relatively uniform climate. some diverse biomes represented in north america include desert, grassland, tundra, and coral reefs.

polar areas, such as antarctica or the south pole.