Universe - All existing matter, space, and energy. Scientists say universe was made 14 Billion years ago and is still expanding.
big band theory - universe started out as a small singular point that was super hot/dense then exploded and began expanding rapidly and made the universe!
earliest galaxy was when the universe was 300-500 million years old
Galaxy - a collection of gas, dust, stars and their solar systems, all held together by gravity

hydrogen-helium 1st element



Spiral Galaxies - Look like pinwheels and have spiral arms that wrap around

Elliptical Galaxies - Look like glowing spheres

Irregular Galaxies - Have no particular shape or organization

we are in the milky way (spiral)


there are between 100 and 200 billion galaxies in the universe

Most galaxies we observe have a redish color. This red color is called Redshift and indicates the galaxy is moving away

If a galaxy has a blueish color it is called Blueshift and indicates that the galaxy is moving toward us