Big history
What is a theory?
best explanation supported by all the evidence
Big band wasn't accepted until the evidence started accumulating - took until about 70 years ago
Big bang
We cannot understand anything by itself unless we understand what happened before it
The big bang is the furthest back we can go. We do not know what happened before it. We do not know why it happened
Thresholds
13.7 billion years ago (around)
Space and time are actually the same thing - they are connected and they create spacetime
If we move at the speed of light we will not travel through time
Best current explanation of how the universe formed
The universe is constantly expanding
There was rapid growth at the beginning of the big band called the expansion
Stars did not form until 400 million years after the big bang
Matter and Antimatter annihilated itself leaving behind 1 billionth of itself. That 1 billionth is what makes up EVERYTHING
e=mc2
energy = mass x the speed of light squared
energy and matter are the same thing
doppler effect
when things are coming towards sound goes higher, when they are going away the sound goes lower
soundwaves compress when they come towards you. Speed of sound + speed of car
soundwaves stretch when thing are travelling away from you. Speed of sound - speed of car
The beg band took place 13.77 years ago, emerging form a singularity
the inflation
the separation of forces, energy and matter
the 'plasma' period of the early universe
the dark ages
the recombination and the CMB
first fractions of the universe saw the universe expand faster than the speed of light
it is impossible to imagine this period. there was no matter
inflation is generally considered to have occurred 10 to the power of -34 seconds after the big bang