Big Bang Flashcards
When did evrything first begin to appear (eath)
13.8 billion years ago
What is then name given to the massive explosion that started the universe
The Big bang
What happened in the first 3 minutes after the big bang
Protons and nuetrons formed
What did protons and neutrons combined to form (big bang)
Hydrogen,helium and lithium nuclei
What building blocks of life weren’t able to form after the big bang
Atoms
After how many years did the universe cool down
400 thousand years after the big bang
What type of radiation exsisted 400 thousand years ago
Cosmic microwave background radiation
After 9 billion years what formed
The solar system
What came from the solar system being created
Gravity,the sun,planets and asteroids and comets
How many years after the big bang did humans first appear
13.8 billion years
What do some scientist believe will happen near the big crunch
That the universe may slow down,it may stop expanding and that the universe may collapse on its self
What did people in india believe the world was being held up by
12 pillars
What model has the earth in the middle
Geocentric model
What is the retrograde motion
Where planets appear to go backwards
What was the later and better model that was found (the model for all the planets with the sun in the middle)
The heliocentric model
What does geocentric mean in greek
Earth at the centre
What is the milky way doing
Moving away from us
What do stars form in and what are they
A nebulae which are huge clouds of gas an dust
Do stars last forever
No they don’t it mostly depends on the star’s size as changes happen to it over time
What happens to bigger and small stars
Big stars lose their fuel quickly while small stars lose their size over time slowly
How long do bigger stars last for
for a few thousand years
