The Universe
What does the theory of the Big Bang suggest?
It suggests that the universe started as a tiny, incredibly hot and dense point around 13.8 billion years ago, and it has been expanding ever since
What are the main two pieces of evidence that support the big bang?
Red shift & Cosmic microwave background
What main factor does the lifecycle of a star depend on?
What is the heliocentric model of the universe?
What is the name of the alternate theory to the Big Bang?
Steady state theory
Are there more medium mass stars or high mass stars in the universe?
medium mass
What is the Geocentric model of the universe?
The belief that the Sun, Moon, planets, and stars —
orbited the Earth in perfect circles
What does the red shift tell us about the universe?
Tells us that the universe is constantly expanding
What do stars begin as?
Nebulae - clouds of gas and dust
What is the composition of a main sequence star?
What existed before the big bang?
A singularity - an extremely hot and dense point
Explain the steady state theory
- universe is infinite in extent and has always existed in roughly the same form observed today
- the universe is still expanding, but new matter is constantly created to keep the overall density of the universe constant
What part of the life cycle does a star spend the most time as?
Main sequence
What is cosmic microwave background?
Leftover radiation/heat from the Big bang
What are the two remnants of a high mass star?
Neutron star & black hole
What is the main difference between the big bang theory and the steady state theory?
Big Bang has a point of origin, steady state assumes the universe always existed
Who discovered red shift?
Hubble
What are the two remnants of a medium mass star?
white dwarf & black dwarf