What are 10 facts about light?

1. light is made up of energy

2. light travels in a straight line

3. the speed of light is exactly 299 792 km per second

4. this is the speed when light is traveling in a vacuum and not obstructed by the atmosphere 5. traveling at the speed of light you could go around the earth seven and a half times in a second

6. light can move super fast super slow and not at all

7. we can use light to weigh Stars

8. we can use light as tweezers

9. bubbles can turn sound into light

10. lasers can make things cold

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.