Across
- 1. planets are only found around these.
- 2. this type of galaxy has a distorted appearance, with no distinct center or arms.
- 6. this type of galaxy has a smooth featureless appearance.
- 7. dark matter cannot absorb, reflect, or emit this.
Down
- 1. the Milky Way is this type of galaxy.
- 3. The type of waves scientist are using to try to communicate with life on other planets.
- 4. the most common explanation for the universe’s origin.
- 5. this type of matter makes up most of the universe.