tag:blogger.com,1999:blog-3428850841046457972.post9017900578546200337..comments2024-03-23T02:29:26.258-07:00Comments on Popular Science: Time A or Time B?Manuel Alfonsecahttp://www.blogger.com/profile/12774826547519124306noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-3428850841046457972.post-3200850051828023282016-03-02T23:59:12.633-08:002016-03-02T23:59:12.633-08:00When you say "fast moving body" you are ...When you say "fast moving body" you are in the frame of special relativity. In general relativity, there is a cosmological equation that applies to the universe as a whole, not to any one of the moving bodies in it. In this equation, one term is a time derivative. The time in question is universal time, the time since the Big Bang, which we can compute by analyzing the redshift of the oldest photons we can receive, those in the cosmic microwave background radiation. In fact, this universal time since the Big Bang has been computed as 13,800 million years. This is what I meant with the allusion in my post.<br />Manuel Alfonsecahttps://www.blogger.com/profile/12774826547519124306noreply@blogger.comtag:blogger.com,1999:blog-3428850841046457972.post-54652046524193545262016-03-02T13:34:10.092-08:002016-03-02T13:34:10.092-08:00Not absolute surely since time since big bang stil...Not absolute surely since time since big bang still depends on frame of reference. Fast moving body will have experienced less time since big bang.Paul Cockshotthttps://www.blogger.com/profile/02955072253738231714noreply@blogger.com