||all of space and all the matter and energy in it.
||something used to represent something else when you cannot use the real thing. a globe is a model of the Earth.
||scientific concept that is generally accepted as true because it has been tested repeatedly by many scientists
|Big Bang Theory
||theory that explains how the universe began, states that the universe began as a single clump of everything (a singularity) and that it EXPLODED and has been expanding ever since.
||happened about 14 billion years ago.
||light from an object moving away from you has a red shift to it. All galaxies and stars have a red shift when observed through a spectroscope.
||first to use the Red Shift to support the Big Bang. Also showed that universe was HUGE and that other galaxies existed outside the Milky Way.
||contain billions upon billions of stars.
||huge clouds of dust and gases out in space and are the birthplaces of stars.
||It takes about 225 million years for the Sun to orbit the center of the Milky Way