| Red-shift tells us that distant galaxies are moving away from us. | Red-Shift |
| What does red-shift indicate about distant galaxies? | They are moving away from us. |
| If galaxies are moving, at some point in the past they must have been closer together. | Past Galaxy Movement |
| What does the movement of galaxies imply about their past positions? | They must have been closer together. |
| The Big Bang theory says that the Universe began from a very small region that was extremely hot and dense. | Big Bang Theory |
| According to the Big Bang theory, how did the Universe begin? | From a very small region that was extremely hot and dense. |
| About 13.8 billion years ago, this tiny point exploded. | 13.8 Billion Years Ago |
| When did the Big Bang occur? | About 13.8 billion years ago. |
| The explosion caused the Universe to expand, and the expansion is still happening today. | Universe Expansion |
| What caused the Universe to expand, and is this expansion still happening? | The explosion caused by the Big Bang, and yes, the expansion is still happening today. |
| The Steady State theory says that the Universe has always existed. | Steady State Theory Existence |
| What does the Steady State theory say about the existence of the Universe? | It says that the Universe has always existed. |
| The Steady State theory says that the Universe is always expanding. | Steady State Expansion |
| What does the Steady State theory say about the expansion of the Universe? | It says that the Universe is always expanding. |
| According to the Steady State theory, new matter is always being created as the Universe expands. | New Matter Creation |
| What does the Steady State theory say about the creation of matter? | It says that new matter is always being created as the Universe expands. |
| This means the average density of the Universe would remain constant. | Density Consistency |
| According to the Steady State theory, what happens to the average density of the Universe as it expands? | It remains constant. |
| Evidence to support the Big Bang theory includes red-shift and cosmic microwave background (CMB) radiation. | Big Bang Evidence |
| What evidence supports the Big Bang theory? | Red-shift and cosmic microwave background (CMB) radiation. |
| Observations of red-shift support the Big Bang theory. However, observations of red-shift can also be accounted for by the Steady State theory. | Red-Shift Observations |
| Which theory can be supported by red-shift observations? | Both the Big Bang theory and the Steady State theory. |
| The Big Bang theory says that large amounts of gamma radiation were released in all directions by the explosion. | Gamma Radiation Release |
| According to the Big Bang theory, what type of radiation was released during the explosion? | Large amounts of gamma radiation in all directions. |
| The expansion of the Universe would have increased the wavelength of this radiation, so it would now be microwave radiation. | Radiation Wavelength Increase |
| What happened to the gamma radiation as the Universe expanded? | Its wavelength increased, so it is now microwave radiation. |
| The Big Bang theory predicts that this radiation should be detected today, in all directions. | Prediction of Radiation Detection |
| What does the Big Bang theory predict about the radiation from the explosion? | It should be detected today, in all directions, as microwave radiation. |
| In 1964, two astronomers detected faint microwave radiation coming from all directions with a new radio telescope. This microwave radiation matched the predictions of the Big Bang theory. | 1964 Discovery |
| What significant discovery was made in 1964 that supported the Big Bang theory? | Faint microwave radiation was detected from all directions, matching the predictions of the Big Bang theory. |
| This radiation is called cosmic microwave background (CMB) radiation. | CMB Radiation |
| What is the name of the microwave radiation detected that supports the Big Bang theory? | Cosmic microwave background (CMB) radiation. |
| Both the Big Bang theory and the Steady State theory say the Universe is expanding. | Universe Expansion |
| Which theories state that the Universe is expanding? | Both the Big Bang theory and the Steady State theory. |
| Both theories can explain the observations of galaxies being red-shifted. | Red-Shift Explanation |
| Which theories can explain the red-shift of galaxies? | Both the Big Bang theory and the Steady State theory. |
| However, only the Big Bang theory can explain the observations of CMB radiation. | CMB Radiation Explanation |
| Which theory explains the observations of CMB radiation? | Only the Big Bang theory. |
| This means the Big Bang theory has more evidence supporting it than the Steady State theory. | Evidence Support |
| Which theory has more evidence supporting it? | The Big Bang theory. |
| Therefore, most scientists support the Big Bang theory. | Scientific Support |
| Which theory do most scientists support and why? | Most scientists support the Big Bang theory because it has more evidence supporting it. |
