| A | B |
|---|
| What is the Big Bang Theory? | The Big Bang Theory states that billions of years ago, the universe began in a single instant with an enormous explosion. |
| When did the Big Bang occur? | According to the textbook, about 13.7 billion years ago |
| What did Hubble discover? | Hubble discovered that the galaxies and other objects were moving away from us....the universe was expanding. |
| What is Hubble's Law? | the father away an object in space is away from us, the faster it's moving away from us. |
| What has been happening to the universe since the Big Bang? | The universe has been expanding. |
| What is cosmic background radiation? | the leftover thermal (heat) energy from the Big Bang. |
| According to the textbook, how old is the universe? | 13.7 billion years old |
| What is the likely end of our universe? | The universe will continue to expand until all of the stars die off and there will be nothing left. |
| What is dark matter? | Matter that doesn't give off electromagnetic radiation. |
| Recently, astronomers have discovered that the expansion of the universe is doing what? | accelerating (speeding up) |
| What is causing the acceleration of the expansion of the universe? | dark energy |
| What is dark energy? | The mysterious force that is causing the expansion of the universe to accelerate (speed up). |
| What are binary star systems? | Star systems made up of 2 stars. |
| What are eclipsing binaries? | a binary star system in which one star periodically blocks the light from the other |
| What are star clusters? | a large group of stars that astronomers believe were made from the same nebula |
| What are open star clusters? Name an example. | Open clusters are a disorganized group of stars, numbering in the thousands. Example: Pleaides, "Seven Sisters", Subaru |
| What are globular clusters? | A dense group of old stars numbering in the millions. |
| What are the 3 types of galaxies? | spiral, elliptical, and irregular |
| Which galaxy has mostly young stars? | irregular |
| Which galaxy has the most stars? | spiral |
| Which galaxy has the oldest stars? | elliptical |
| What is the name of our home galaxy? | Milky Way |
| What type of galaxy is our home galaxy? | spiral |
| Where are we located on our home galaxy? | On one the spiral arms of our galaxy. |
