PHYS 005 Lecture Notes - Lecture 16: Planck Time, Electromagnetism, Accretion Disk
5 Jul 2018
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Session 16 (session 18) The Big Bang and Cosmic Microwave Radiation
Ch. 26 Section 3
If nothing falls into the black hole
●Will not turn into a quasar
●Will not grow anymore
NOTHING comes out of the black hole, more like things come out of accretion disk
Natural sciences- based on & proven w. experiments that can be performed over & over again w the
same result
●Astronomers cannot actually produce BH in labs
●Depend on statistics (looking @ many objects) or simulate through computer
Stars present a lot of answers for astronomers
●Understand them the most
●Guide our answers to universe
The Big Bang
13.7 billion yrs ago
●NOT an explosion
○Everything from nothingness-> SUDDENLY appearing
Oldest stars in globular clusters- universe must be as close to this age
●“Moons” of the galaxy
Was there a universe before ours?- before existence
●Time & space did not exist as we conceive them know before Big Bang
●No answers
The Observable Universe
What can we see + what is size of Universe
●FINITE number of matter in your universe
○Matter can condense (in a BH)- still exists
●Finite stars & no. of galaxies in an INFINITE universe
**Only things that emit light 13 billion years ago are in the OBSERVABLE UNIVERSE
●https://ilearn.ucr.edu/bbcswebdav/pid-3220436-dt-content-rid-23575451_1/courses/PHYS_005
_001_18S/Session%2018%20-%20Big%20Bang%20and%20CMB%281%29.pdf pg. 23
Every single day, you see something that is FARTHER into the universe- earth keeps receiving light fr, pb
objects
Has not been in the same place for 13.7 billion years
Document Summary
Session 16 (session 18) the big bang and cosmic microwave radiation. Nothing comes out of the black hole, more like things come out of accretion disk. Natural sciences- based on & proven w. experiments that can be performed over & over again w the same result. Astronomers cannot actually produce bh in labs. Depend on statistics (looking @ many objects) or simulate through computer. Stars present a lot of answers for astronomers. Oldest stars in globular clusters- universe must be as close to this age. Was there a universe before ours?- before existence. Time & space did not exist as we conceive them know before big bang. What can we see + what is size of universe. Finite number of matter in your universe. Matter can condense (in a bh)- still exists. Finite stars & no. of galaxies in an infinite universe. **only things that emit light 13 billion years ago are in the observable universe.
