| Earth to moon | 1 second |
| Earth to sun | 500 seconds (8 min.) |
| Sun to Mars | 12.5 minutes |
| Sun to Jupiter | 40 minutes |
| Sun to Pluto | 5.5 hours |
| Solar system diameter (at orbit of Pluto) | 11 hours |
| Sun to nearest star | 4 years |
| Sun to center of galaxy | 30,000 years |
| Diameter of galaxy | 100,000 years |
| Distance of Andromeda galaxy | 2 million years |
| Distance to "edge" of universe | 15 billion years |
To convert light travel time to kilometers multiply travel time in seconds by velocity of light (300,000 kilometers per second).
Click the BACK button on your browser to return to the document...