PHYS 005 Lecture Notes - Lecture 9: Protostar, Whirlpool Galaxy, Immanuel Kant
5 Jul 2018
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April 20 Island Universes and the Distance to the Galaxies
Reading- Ch. 24 Sect. 1,2
Blue light is lost whenever galaxies collide into each other
Dark matter has nothing to do with black holes
●Black holes- when a star dies & core is so massive it collapses on itself
○Made of regular matter
, absorbs light we can see
Dark energy has nothing to do with black holes
●We have little idea of what dark energy is
DARK ENERGY DOES NOT EQUAL DARK MATTER
●Dark energy- RIPS things in the universe APART
●Dark matter- PULLS things TOGETHER
Everything that makes up universe- regular matter- (baryonic)
● ONLY 5% OF THE UNIVERSE IS MADE UP OF BARYONIC MATTER
○Composed of neutrons, protons, and electrons
Dark matter
●Non-baryonic matter
●Only on outskirts
●PRODUCES GRAVITY & HAS MASS
○Neither blocks nor produces light
●MAKES UP 24% OF THE UNIVERSE
Dark Energy
●DOES NOT HAVE MASS
○Not a particle
●Amt of energy that must exist to explain accelerated expansion of the Universe
●71% of the Universe to match the current expansion rate
Black Hole in Milky Way- 20x bigger than sun, but 4 million times more mass than Sun
● A lot of space compacted into a small space
●Black hole is too small for us to feel pull OR affect the spiral arms of the milky way
**if the black hole is not the middle of the Milky Way, what is?
Andromeda- 2 million ly- A TRILLION stars- 5x bigger than MW
Virgo Supercluster- 10 million ly
Local Superclusters-500 million ly
***Wherever DARK MATTER IS, regular matter exists as well
●Dark matter SURROUNDS regular matter
○Eventually pulled in regular matter until dark matter appeared
●Voids have almost NO DARK MATTER, which means NO REGULAR MATTER
Document Summary
April 20 island universes and the distance to the galaxies. Blue light is lost whenever galaxies collide into each other. Dark matter has nothing to do with black holes. Black holes- when a star dies & core is so massive it collapses on itself. Made of regular matter , absorbs light we can see. Dark energy has nothing to do with black holes. We have little idea of what dark energy is. Dark energy- rips things in the universe apart. Everything that makes up universe- regular matter- (baryonic) Only 5% of the universe is made up of baryonic matter. Amt of energy that must exist to explain accelerated expansion of the universe. 71% of the universe to match the current expansion rate. Black hole in milky way- 20x bigger than sun, but 4 million times more mass than sun. A lot of space compacted into a small space.
