Observations about the Universe Flashcards
what was formed after particles and antiparticles annihilate each other
photons of radiation
these photons also materialize into what
particle-antiparticle pairs
the only ones that could form during this point
Hydrogen and Helium
Explain why Hydrogen and Helium are the only ones that could form during that point
the universe was still too hot for neutral atoms to exist
formation of neutral atoms
the universe cooled down
It interacts weakly with neutral particles
photons
something interacts weakly with neutral particles so matter and photons ______ and the universe became _______
decoupled - transparent
the expansion of the universe red-shifted its radiation to longer wavelengths
cosmic microwave background radiation
the universe was created by the creator-sun god Ra from a vast, cosmic ocean of nothingness
Egyptian mythology
the universe and all life in it was created by God
Creation story
universe has no beginning and no end
steady state theory
the expanding universe has an unchanging density due to continuous creation of matter
steady state theory
neutral atoms of what elements were the first ones to be formed
Hydrogen and Helium
neutral atoms are not feasible in extremely ____ temperatures
high
it is essentially constant
density
incredibly bright objects that can only be found of great distances away from us
quasars
these can only be found in the beginning of the universe
quasars
the discovery of this tells us there is a beginning
quasars
he observed the movement of galaxies away from each other
edwin hubble
he reasoned that the universe must have started moving outward from what
a common point at the same time
the universe compressed into a single and dense point also known as
singularity
the universe was initially very what
hot
fuel of heavenly bodies
hydrogen and helium
bigbang theory needed this theory to explain itself
general theory of relativity
the movement of matter is defined by the distortion of space and time made by other matter
general theory of relativity
the timing and beginning of the big bang were calculated through the measurement of what
speeds of galaxies and distances among them
they calculated _____ in time to determine when were all joined in a single point and through what
backward - hubble’s law
give (1) supporting observations in big bang theory
the expansion of the universe
give (2) supporting observations in big bang theory
the relative abundances of hydrogen and helium
give (3) supporting observations in big bang theory
the cosmic microwave background radiation
the universe has no beginning and no end
steady state theory
the universe is unchanging
steady state theory
the expansion rate of the universe speeds us
big bang theory
all the galaxies will down and eventually revert back to the center to form another point of density
closed universe (big crunch)
the gravity of the universe won’t be enough to stop the expansion, thus, galaxies will continue to spread apart
open universe
