How Long Does Light Live?
Most recent answer: 06/18/2013
- Mona Morstein (age 52)
Mesa, AZ, USA
If a particle of light, called a photon, doesn't bump into anything and get absorbed it just keeps on going forever. Astronomers have observed light from stars that has been travelling for 10 billion years or so. Mind boggling.
This is what the night sky looked like 13 billion years ago. See
That light hasn't "died" since but it has reduced energy due to the stretching of the universe. Mike W.
(published on 06/18/2013)