Across
- 2. This is the planet that is closest to the sun.
- 6. Plants use this method to grow.
- 8. People at NASA officially landed a piece of equipment onto this planet.
- 11. All living outdoors is considered this.
- 12. A visible, thinly spread cloud of interstellar gas and dust
- 14. These are what is on the periodic table.
- 17. All existing matter and space considered as a whole.
- 18. This is a basic chemical element.
- 19. The earth is known as one of these.
- 20. This is what the sun is classified as.
Down
- 1. Part of an atom with no charge.
- 3. The sun contains mostly this.
- 4. Earth does this around the sun.
- 5. If you spend one day on this planet, it is around 1 year in earth time.
- 7. They send these to space to look for new things.
- 9. This object takes up 99.8% of our solar system.
- 10. This is the planet with a ring formed around it.
- 13. The sun only has 7.9% of this.
- 15. Positive part of a atom.
- 16. This is the power-house of the cell.