Observations about the Universe

Question 1

what was formed after particles and antiparticles annihilate each other

Answer 1

photons of radiation

Question 2

these photons also materialize into what

Answer 2

particle-antiparticle pairs

Question 3

the only ones that could form during this point

Answer 3

Hydrogen and Helium

Question 3

Explain why Hydrogen and Helium are the only ones that could form during that point

Answer 3

the universe was still too hot for neutral atoms to exist

Question 4

formation of neutral atoms

Answer 4

the universe cooled down

Question 5

It interacts weakly with neutral particles

Answer 5

photons

Question 6

something interacts weakly with neutral particles so matter and photons ______ and the universe became _______

Answer 6

decoupled - transparent

Question 7

the expansion of the universe red-shifted its radiation to longer wavelengths

Answer 7

cosmic microwave background radiation

Question 8

the universe was created by the creator-sun god Ra from a vast, cosmic ocean of nothingness

Answer 8

Egyptian mythology

Question 9

the universe and all life in it was created by God

Answer 9

Creation story

Question 10

universe has no beginning and no end

Answer 10

steady state theory

Question 11

the expanding universe has an unchanging density due to continuous creation of matter

Answer 11

steady state theory

Question 12

neutral atoms of what elements were the first ones to be formed

Answer 12

Hydrogen and Helium

Question 13

neutral atoms are not feasible in extremely ____ temperatures

Answer 13

high

Question 14

it is essentially constant

Answer 14

density

Question 15

incredibly bright objects that can only be found of great distances away from us

Answer 15

quasars

Question 16

these can only be found in the beginning of the universe

Answer 16

quasars

Question 17

the discovery of this tells us there is a beginning

Answer 17

quasars

Question 18

he observed the movement of galaxies away from each other

Answer 18

edwin hubble

Question 19

he reasoned that the universe must have started moving outward from what

Answer 19

a common point at the same time

Question 20

the universe compressed into a single and dense point also known as

Answer 20

singularity

Question 21

the universe was initially very what

Answer 21

hot

Question 22

fuel of heavenly bodies

Answer 22

hydrogen and helium

Question 23

bigbang theory needed this theory to explain itself

Answer 23

general theory of relativity

Question 24

the movement of matter is defined by the distortion of space and time made by other matter

Answer 24

general theory of relativity

Question 25

the timing and beginning of the big bang were calculated through the measurement of what

Answer 25

speeds of galaxies and distances among them

Question 26

they calculated _____ in time to determine when were all joined in a single point and through what

Answer 26

backward - hubble's law

Question 27

give (1) supporting observations in big bang theory

Answer 27

the expansion of the universe

Question 28

give (2) supporting observations in big bang theory

Answer 28

the relative abundances of hydrogen and helium

Question 29

give (3) supporting observations in big bang theory

Answer 29

the cosmic microwave background radiation

Question 30

the universe has no beginning and no end

Answer 30

steady state theory

Question 31

the universe is unchanging

Answer 31

steady state theory

Question 32

the expansion rate of the universe speeds us

Answer 32

big bang theory

Question 33

all the galaxies will down and eventually revert back to the center to form another point of density

Answer 33

closed universe (big crunch)

Question 34

the gravity of the universe won't be enough to stop the expansion, thus, galaxies will continue to spread apart

Answer 34

open universe