1. Speed of light

2. A race to compare the speed of light to other things A quick comparison of how far things can go in 1 second. Start Fastest Athletes Cheetah Fastball Drag racer Bullet Supersonic Jet Crack of thunder Flash of lightning 10 m 25 m 45 m

3. Most are still going Drag Racer 175 m Bullet (still going) Supersonic Jet (still going) Crack of thunder Flash of lightning We will continue these throughout the presentation! They are roughly to scale.

4. Astronomical Distances Light takes 8 minutes to get from the Sun to the Earth. It takes 4 years to get here from the next nearest star aside from the sun, Proxima Centauri which is 4 light years away. Light year-The distance light travels in one year 9.5 x10 15 m (a really big distance)

5. Space travel problems Since we can’t even get close to the speed of light deep space travel would take extreme amounts of time. crack of thunder (340 m)

6. Looking into the past Every time you look at the stars you are looking at the distant past. If you see a star that was 100 light years away blow up (supernova) it actually blew up 100 years ago. It just took the light that long to get to you.

7. Speed of light in things other than a vacuum Whenever light hits a medium it slows it down. The more dense the material the slower light can travel. Therefore light tends to travel faster in a gas, and slowest in a solid. It travels fastest in a vacuum (nothing)

8. Speed of light in different substances Bullet (780 m) Vacuum2.99792458 x 10 8 m/s Air2.9970 x 10 8 m/s Water2.26 x 10 8 m/s Glass1.97 x 10 8 m/s Diamond1.24 x 10 8 m/s

9. It may slow down but… It is still unbelievably fast compared to everything else. You can not travel faster than the speed of light. Several interesting things happen when you get close. Supersonic Jet (900 m)

10. How far will that light go If I had 15,000 more slides just like this one, I could cover the distance light would travel (300,000,000 m)