Re: flat vs asymptotically flat universe

2017-11-13 Thread agrayson2000
On Sunday, November 12, 2017 at 1:42:13 PM UTC-7, agrays...@gmail.com wrote: > > > > On Thursday, November 9, 2017 at 4:42:45 PM UTC-7, Brent wrote: >> >> Cosmologist think the universe is spatially flat. That just means >> triangles have interior angles summing to 180deg. It doesn't have

Re: flat vs asymptotically flat universe

2017-11-12 Thread agrayson2000
On Thursday, November 9, 2017 at 4:42:45 PM UTC-7, Brent wrote: > > Cosmologist think the universe is spatially flat. That just means > triangles have interior angles summing to 180deg. It doesn't have anything > to do with extent. But the universe is not flat in spacetime; it's >

Re: flat vs asymptotically flat universe

2017-11-12 Thread Bruno Marchal
On 11 Nov 2017, at 21:50, agrayson2...@gmail.com wrote: On Saturday, November 11, 2017 at 12:40:45 PM UTC-7, Bruno Marchal wrote: On 11 Nov 2017, at 07:59, agrays...@gmail.com wrote: On Friday, November 10, 2017 at 11:32:13 PM UTC-7, agrays...@gmail.com wrote: On Friday,

Re: flat vs asymptotically flat universe

2017-11-11 Thread agrayson2000
On Saturday, November 11, 2017 at 12:40:45 PM UTC-7, Bruno Marchal wrote: > > > On 11 Nov 2017, at 07:59, agrays...@gmail.com wrote: > > > > On Friday, November 10, 2017 at 11:32:13 PM UTC-7, agrays...@gmail.com > wrote: >> >> >> >> On Friday, November 10, 2017 at 11:22:45 PM UTC-7, Brent

Re: flat vs asymptotically flat universe

2017-11-11 Thread Bruno Marchal
On 11 Nov 2017, at 07:59, agrayson2...@gmail.com wrote: On Friday, November 10, 2017 at 11:32:13 PM UTC-7, agrays...@gmail.com wrote: On Friday, November 10, 2017 at 11:22:45 PM UTC-7, Brent wrote: On 11/10/2017 10:01 PM, agrays...@gmail.com wrote: On Friday, November 10, 2017 at

Re: flat vs asymptotically flat universe

2017-11-11 Thread agrayson2000
On Friday, November 10, 2017 at 11:59:15 PM UTC-7, agrays...@gmail.com wrote: > > > > On Friday, November 10, 2017 at 11:32:13 PM UTC-7, agrays...@gmail.com > wrote: >> >> >> >> On Friday, November 10, 2017 at 11:22:45 PM UTC-7, Brent wrote: >>> >>> >>> >>> On 11/10/2017 10:01 PM,

Re: flat vs asymptotically flat universe

2017-11-10 Thread agrayson2000
On Friday, November 10, 2017 at 11:32:13 PM UTC-7, agrays...@gmail.com wrote: > > > > On Friday, November 10, 2017 at 11:22:45 PM UTC-7, Brent wrote: >> >> >> >> On 11/10/2017 10:01 PM, agrays...@gmail.com wrote: >> >> >> >> On Friday, November 10, 2017 at 2:16:04 PM UTC-7, Brent wrote: >>>

Re: flat vs asymptotically flat universe

2017-11-10 Thread agrayson2000
On Friday, November 10, 2017 at 11:22:45 PM UTC-7, Brent wrote: > > > > On 11/10/2017 10:01 PM, agrays...@gmail.com wrote: > > > > On Friday, November 10, 2017 at 2:16:04 PM UTC-7, Brent wrote: >> >> >> >> On 11/10/2017 1:01 PM, agrays...@gmail.com wrote: >> >> >> >> On Friday, November 10,

Re: flat vs asymptotically flat universe

2017-11-10 Thread Brent Meeker
On 11/10/2017 10:01 PM, agrayson2...@gmail.com wrote: On Friday, November 10, 2017 at 2:16:04 PM UTC-7, Brent wrote: On 11/10/2017 1:01 PM, agrays...@gmail.com wrote: On Friday, November 10, 2017 at 12:19:05 PM UTC-7, Brent wrote: On 11/10/2017 4:06 AM, Alan Grayson

Re: flat vs asymptotically flat universe

2017-11-10 Thread agrayson2000
On Friday, November 10, 2017 at 2:16:04 PM UTC-7, Brent wrote: > > > > On 11/10/2017 1:01 PM, agrays...@gmail.com wrote: > > > > On Friday, November 10, 2017 at 12:19:05 PM UTC-7, Brent wrote: >> >> >> >> On 11/10/2017 4:06 AM, Alan Grayson wrote: >> >> >> >> On Thu, Nov 9, 2017 at 10:32 PM,

Re: flat vs asymptotically flat universe

2017-11-10 Thread Brent Meeker
On 11/10/2017 1:01 PM, agrayson2...@gmail.com wrote: On Friday, November 10, 2017 at 12:19:05 PM UTC-7, Brent wrote: On 11/10/2017 4:06 AM, Alan Grayson wrote: On Thu, Nov 9, 2017 at 10:32 PM, Brent Meeker wrote: On 11/9/2017 9:15 PM, Alan

Re: flat vs asymptotically flat universe

2017-11-10 Thread Alan Grayson
On Fri, Nov 10, 2017 at 12:19 PM, Brent Meeker wrote: > > > On 11/10/2017 4:06 AM, Alan Grayson wrote: > > > > On Thu, Nov 9, 2017 at 10:32 PM, Brent Meeker > wrote: > >> >> >> On 11/9/2017 9:15 PM, Alan Grayson wrote: >> >> >> >> On Thu, Nov 9, 2017

Re: flat vs asymptotically flat universe

2017-11-10 Thread agrayson2000
On Friday, November 10, 2017 at 12:19:05 PM UTC-7, Brent wrote: > > > > On 11/10/2017 4:06 AM, Alan Grayson wrote: > > > > On Thu, Nov 9, 2017 at 10:32 PM, Brent Meeker > wrote: > >> >> >> On 11/9/2017 9:15 PM, Alan Grayson wrote: >> >> >> >> On Thu, Nov 9, 2017 at 10:05

Re: flat vs asymptotically flat universe

2017-11-10 Thread Brent Meeker
On 11/10/2017 4:06 AM, Alan Grayson wrote: On Thu, Nov 9, 2017 at 10:32 PM, Brent Meeker > wrote: On 11/9/2017 9:15 PM, Alan Grayson wrote: On Thu, Nov 9, 2017 at 10:05 PM, Brent Meeker

Re: flat vs asymptotically flat universe

2017-11-10 Thread Alan Grayson
On Thu, Nov 9, 2017 at 10:32 PM, Brent Meeker wrote: > > > On 11/9/2017 9:15 PM, Alan Grayson wrote: > > > > On Thu, Nov 9, 2017 at 10:05 PM, Brent Meeker > wrote: > >> >> >> On 11/9/2017 8:55 PM, agrayson2...@gmail.com wrote: >> >> >> >> On Thursday,

Re: flat vs asymptotically flat universe

2017-11-09 Thread Brent Meeker
On 11/9/2017 9:15 PM, Alan Grayson wrote: On Thu, Nov 9, 2017 at 10:05 PM, Brent Meeker > wrote: On 11/9/2017 8:55 PM, agrayson2...@gmail.com wrote: On Thursday, November 9, 2017 at 8:00:45

Re: flat vs asymptotically flat universe

2017-11-09 Thread Alan Grayson
On Thu, Nov 9, 2017 at 10:05 PM, Brent Meeker wrote: > > > On 11/9/2017 8:55 PM, agrayson2...@gmail.com wrote: > > > > On Thursday, November 9, 2017 at 8:00:45 PM UTC-7, Brent wrote: >> >> >> >> On 11/9/2017 6:23 PM, Alan Grayson wrote: >> >> The difference between

Re: flat vs asymptotically flat universe

2017-11-09 Thread Brent Meeker
On 11/9/2017 8:55 PM, agrayson2...@gmail.com wrote: On Thursday, November 9, 2017 at 8:00:45 PM UTC-7, Brent wrote: On 11/9/2017 6:23 PM, Alan Grayson wrote: The difference between spatially flat and asymptotically flat for a huge universe would be virtually impossible to

Re: flat vs asymptotically flat universe

2017-11-09 Thread agrayson2000
On Thursday, November 9, 2017 at 8:00:45 PM UTC-7, Brent wrote: > > > > On 11/9/2017 6:23 PM, Alan Grayson wrote: > > The difference between spatially flat and asymptotically flat for a huge > universe would be virtually impossible to distinguish by measuring the sum > of angles in a triangle.

Re: flat vs asymptotically flat universe

2017-11-09 Thread Brent Meeker
On 11/9/2017 6:23 PM, Alan Grayson wrote: The difference between spatially flat and asymptotically flat for a huge universe would be virtually impossible to distinguish by measuring the sum of angles in a triangle. Moreover, I don't see how spatially flat can have nothing to do with extent,

Re: flat vs asymptotically flat universe

2017-11-09 Thread Alan Grayson
The difference between spatially flat and asymptotically flat for a huge universe would be virtually impossible to distinguish by measuring the sum of angles in a triangle. Moreover, I don't see how spatially flat can have nothing to do with extent, since in applying Euclidean geometry we surely

Re: flat vs asymptotically flat universe

2017-11-09 Thread Brent Meeker
Cosmologist think the universe is spatially flat.  That just means triangles have interior angles summing to 180deg.  It doesn't have anything to do with extent.  But the universe is not flat in spacetime; it's expanding and at an increasing rate. Brent On 11/9/2017 3:10 PM,