| A | B |
|---|
| fusion | the combining of atoms to form a new element and release energy |
| light year | measures distance |
| first stage in a star's life cycle | nebula |
| cosmology | study of the universe |
| first step in the scientific method | identify the problem and determine what you want to know |
| metric unit of distance | kilometer |
| largest in terms of galaxies is a | supercluster |
| stars are different colors because | they have different temperatures |
| What is the name of the galaxy group that we travel with? | Local Group |
| According to the Big Bang Theory, the Universe is about ______ years old | 10-20 billion |
| According to the Big Bang Theory, the contents of the universe were under extreme | pressure, density, and temperature |
| About how many members are in our galaxy group? | 35 |
| Edwin Hubble believed that | the galaxies are moving away from each other |
| steady-state theory | states that the universe does not change over time |
| What is the origin of cosmic background radiation? | It is leftover from the Big Bang |
