Our solar system is located within the Milky Way galaxy. Our galaxy has around 400 billion stars within it, with many clusters and nebulae. Our Galaxy is 100,000 lightyears in diameter. Becasue the Milky Way is a spiral galaxy it has what scientests call arms. Our solar system is located in one of the arms, and it happens to be one of the smaller ones. It is either refered to as the Local or the Orion Arm, which connects two other larger arms that make up our galaxy. Being located within an arm of the galaxy we are toward the outer part of the Milky Way. Our solar system is about 20 light years above the equatorial symmetry plane. Our solar system is thought to be about 4.5 billion years old and we as humens have only been around for a few million of them.
The Big Bang is when astronimers said that there was a sudden explosion of all energy and matter that caused an expansion. It is said that all space and even time began or started at this point. 13.7 years ago the big bang occoured. 600 million years after the big bang the forst atoms were formed which made it possible for galaxies and other features like our planets to form. So after the big bang there was space, matter, energy and time for our universe to form and become in motion with eachother.
Observations of the cosmic microwave background have helped to determine the age of the universe, because it helped to discoever that sending a satalite into space to read the radiation that was emitted into the universe coming back to the earth showing different cold and warm spots. The size and heat of the spots that appear in the pictures helped scientists to discover how old our universe is.
Bibliography
Augest 25, 2005
Hartmut Frommert, Christine Kronberg
Formation of the Universe
Febuary 27, 2010
Ron Cowen
Typos lead me to distrust accuracy checking on all other items:
ReplyDelete"13.7 years ago the big bang occoured. 600 million years after the big bang the forst atoms were formed"
...So I was born before the big Bang?