- Light travels through the vacuum of space at 299,793 km per second (which is 1,079,252,960 km per hour); or 186,282 miles per second (which is 670,619,880 miles per hour).
- The speed of light is not constant; it travels about 3 percent more slowly through air and much more slowly through glass or water.
Some examples of different mediums and their respective index;
- Air/Vacuum with an index of 1.0 which is 299,460 km/sec
- Water with an index of 1.33 which is 225,158 km/sec
- Glass with an index of 1.5 which is 199,640 km/sec
- Diamond with an index of 2.42 which is 123,744 km/sec
Estimated travel time of light between places or objects
- Sun to Earth: 8.3 minutes
- Moon to Earth: 1.25 seconds
- Sun to Pluto: 5 hours and 40 minutes
- Pluto to the nearest star: 4.3 years
- Across our Milky Way Galaxy: 100 000 years
- Andromeda Galaxy to Earth: 2.5 million years
- 1 Kilometer: 3.3 microseconds
- 1 meter: 3.3 nanoseconds
- Circumference of the earth ( measured on the equator ): 134 milliseconds
- Alpha Centauri to earth : 4.4 years
- Sun to Jupiter: 41 minutes
- Sun t Saturn: 1 hour and 25 minutes
- Sun to Neptune: 4.2 hours
- Sun to Acrux ( Brightest star of Southern Cross): 321 years
- Sun to Crab Nebula: 6300 years
- Earth to known limit of observable Universe: 15,000,000,000 years
- Amount of times around the earth in 10 seconds: Approx: 70 times
No comments:
Post a Comment