Earth Science Test #1: Big Bang, CMBR, etc
About what percentage of universe are shifted towards red?
98%
What is the shape of our galaxy?
A spiral
What is happening to temperature of the universe since the BBT?
It's been getting colder.
Who were the 2 men that discovered CMBR?
Penzias & Wilson
A light year is...
The distance traveled by light in one year
Approximate age of the universe
13.8 billion years old
Up to how many years after the Big Bang do we have evidence for?
380,000 years
What is in the center of most galaxies?
A black hole
What is happening to the distance between objects in the universe?
As the universe expands, distances increase.
As a star or galaxy moves towards Earth, what color do the special lines shift towards?
Blue
What does CMBR stand for?
Cosmic Microwave Background Radiation
Which evidence best supports the theory that the universe was created by an explosion called the Big Bang?
Cosmic background microwave radiation
As the universe expands, what happens to the distance between objects?
Distances increase.
Which is the most harmful form of radiation?
Gamma Rays
Approximately how many stars are found in galaxies?
Hundreds of billions
What does the CMBR prove about the Big Bang?
It proves the theory of cosmic expansion/inflation
Why was there no light in the beginning of the Big Bang?
It was too hot and therefore photons of light could not travel freely.
Which portion of the electromagnetic spectrum is found throughout space?
Microwave
Where is our solar system located within the galaxy?
On an spiral arm; more specifically the Orion
Least harmful?
Radio waves
As a star or a galaxy moves away from Earth, what color do the special lines shift towards?
Red
Most galaxies (98%) in the universe are shifted towards which color?
Red
What is name of our Galaxy?
The Milky Way Galaxy
What is this evidence for?
The universe is indeed expanding = the Big Bang theory