What is redshift?
The shifting of spectral lines towards the end of the spectrum.
What does redshift tell us?
an object is moving away
The more redshifted something is, the ____ it is moving.
What does the presence of a redshift tell us about the universe?
it is expanding
When something is redshifted, the spectral lines are moved towards the red end of the spectrum, which as ________ wavelengths.
The big bang theory states that _____ was converted to _____ when elementary particles were converted into hydrogen and helium.
What happens when a proton and an antiproton collide?
they annihilate each other
What is the big freeze?
The universe will keep expanding until it is too cold to support life.
What is the big rip?
The universe will expand so rapidly that every thing will get ripped apart.
What is the big crunch?
The universe will collapse on itself.
What view of the universe states that it is eternal and unchanging?
What do studies of the cosmic microwave background (CMB) tell us?
galaxies being carried away
Where does the CMB come from?
photons released when electrons and nuclei in Big Bang
When was CMB discovered? When was it mapped out?
What does the CMB thought to prove?
How much of the total mass and energy in the universe is dark matter and energy?
What is the multiverse theory?
suggests that there are many universes
What options are presented in the notes for how the universe began?
someone made it, it made itself, always been here
Which of the options you recorded int #18 was eliminated as a possibility?
always been here
Is there a center to the universe?
What two things does the cosmological principle state about the universe?
it is homogenous and isotropic
What was created by the release of energy from the big bang?
matter, space, time, gravity
How old is the universe believed to be?
13.7 billion years
The universe is believed to have originated from a single point called a _________?
The cosmological principle states that there is not a ______ or _______ to the universe?
What is the rate of expansion of the universe dependent on?
Give two reasons why cosmology is difficult to study.
so far apart, so small
Using the age of one thing to compare it to the age of another is a definition of ________.