Across
- 5. Some people think that ___________ live on other planets.
- 7. Earth is a _________ that moves around the sun.
- 9. There is no air in ___________.
- 10. Our ________ is called the Milky Way.
- 11. The ________ on Earth lets us breathe and survive.
Down
- 1. All planets ____________ around the sun.
- 2. A ________ is made up of rock, ice and gas.
- 3. A __________ to another planet could take many years.
- 4. There are many galaxies in the __________.
- 6. Earth is the third planet in our ___________ system
- 8. Scientists _________ whether there is life on other planets.