Across
- 3. Big balls of combustion found all over outer space.
- 4. Light that is made naturally.
- 13. The introduction of a substance harmful to the environment.
- 14. Light made by people.
- 15. The lights in front of a car used to improve visibility.
- 16. The period of time in which the sun is not illuminating the sky.
- 17. how easy something is to see.
- 18. The star in the middle of our solar system.
Down
- 1. brightening of the night sky caused by street lights and other man-made sources.
- 2. A light illuminating the road, usually lighting up a road.
- 3. brightness of the night sky in a built-up area as a result of light pollution.
- 5. Unwanted light intruding someplace.
- 6. The presence of excessive artificial lighting.
- 7. The various lights used to illuminate a city in the night time.
- 8. A device that emits light
- 9. The light that comes from the sun.
- 10. a substance poisoning an animal or resource.
- 11. Light being emitted
- 12. An electromagnetic radiation that stimulates the eyes and allows you to see.
- 14. The mass of air surrounding the earth.
- 18. the region of the atmosphere and outer space seen from the earth.