3 ms·
Just a slight correction: The distance from Earth to the edge of the observable universe is 46 Gly, not 13.7 Gly, because of the metric expansion of space.
by xenophonf 13y ago
Just a slight correction: The distance from Earth to the edge of the observable universe is 46 Gly, not 13.7 Gly, because of the metric expansion of space.
- ggdG 13y agoTrue. The light has been traveling for "only" 13.7 billion years, but meanwhile the space between origin & destination kept expanding. That's why I wrote about an apparent radius, but on further thought I no longer believe that the travel time will reflect in an apparent distance. It's the amount of redshift that will result in a calculated proper distance.