4 ms·
isn't it a bit odd to call light "old" since it's the one thing that actually does not age by definition. i understand they're just counting the time from when
by leeoniya 13y ago
isn't it a bit odd to call light "old" since it's the one thing that actually does not age by definition. i understand they're just counting the time from when it was first emitted, but still...
- breadbox 13y agoIndeed. But it can be hard to do any kind of science popularization if you don't allow yourself to talk about time in a non-relativistic way (when it's not germane to the main point). We just don't have the vocabulary, much less the basic concepts, to talk like that.
- arethuza 13y agoSort of related to that, is it valid to say it is the "same" photon that is absorbed and re-emitted?
- leeoniya 13y agomaybe they're just trying to live up to the domain name :)