P8: THE BIG BANG THEORY + RED SHIFT

Question 1

What was the big bang theory?

Answer 1

-the theory that about 13.8 billion years ago the whole universe was a very small, extremely hot and dense region
-from this tiny point, the whole universe expanded outwards to what exists today and it continues to expand

Question 2

What is red shift?

Answer 2

• light appears red shifted from galaxies which are moving away from Earth
• the change with distance of each galaxy’s speed is evidence of an expanding universe

Question 3

How much of space do we not know about/don’t understand?

Answer 3

95%