idea
Light takes time
Light travels fast and still takes time. Sunlight is about eight minutes old when it reaches us, and the light of the Andromeda galaxy has travelled around two and a half million years. Looking farther away is looking further back.
Connects to
- Astronomy
- The expanding universe
- Time and motion
- Are we alone?
- What is the far sky like now?
- Color
- Is there life elsewhere?