lesson 2 - big bang theory - stephen hawking

did stephen hawking make the big bang theory

no, he popularised it

what book did stephen hawking publish about big bang theory

a brief history of time

when did the big bang occur

13.7 billion year ago

how old is earth

4.5 billion years old

what was there before the big bang

• no space

• no time

• no particles

• singularity

what are the characteristics of a singularity

• no particles

• intense gravity

• intense heat

• infinitely dense

• infinitesimally small

• expanded to make the universe

what is the proof of the big bang

• einstein’s theory of relativity

• edwin hubble realised galaxies are getting further apart

• cosmic radiation

how is an expanding universe proof of the big bang

as by extrapolating the data we can see an expanding singularity of a universe must have started infinitesimally small

how does cosmic radiation prove the big bang

the wavelengths are different when they travel towards you vs away from you, and currently it is travelling away from us so it must have originally been a singularity that expanded

what 2 books did richard dawkins publish

• the selfish gene

• the god delusion

when did humans first start to evolve

1.4 million years ago

when were fish first seen

500 million years ago

when did earth’s first life forms appear

3.5 billion years ago

how did richard dawkins say evolution can be proved

through how silver foxes were breeded to be tame or aggressive

what does dawkins believe about fossils and evolution

that you do not need fossils to prove evolution