Re: Is the universe infinite, or does it have a limit?

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Sujet : Re: Is the universe infinite, or does it have a limit?
De : PointedEars (at) *nospam* web.de (Thomas 'PointedEars' Lahn)
Groupes : sci.astro
Date : 07. Feb 2026, 23:52:55
Autres entêtes
Organisation : PointedEars Software (PES)
Message-ID : <10m8fo7$9gf8$2@gwaiyur.mb-net.net>
References : 1 2 3 4 5 6 7 8 9 10
User-Agent : Mozilla Thunderbird
john larkin wrote:
On Sat, 7 Feb 2026 22:39:34 +0100, Thomas 'PointedEars' Lahn
<PointedEars@web.de> wrote:
3. By contrast to light, gravitational waves are quadrupole waves that are
  only emitted when the spacetime curvature changes in a non-spherically
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  symmetric way.  They are also emitted by objects and systems which do not
     ^^^^^^^^^^^^^
  emit light.
 
Suppose that somewhere out in free space a cannonball somehow
appeared. Wouldn't that create a symmetric, spherical gravitational
wave?

It would not, for the reason that I have just explained.

--
PointedEars

Twitter: @PointedEars2
Please do not cc me. / Bitte keine Kopien per E-Mail.

Date Sujet#  Auteur
5 Feb 26 * Re: Is the universe infinite, or does it have a limit?40Jan Panteltje
5 Feb 26 +* Re: Is the universe infinite, or does it have a limit?4Bill Sloman
6 Feb 26 i`* Re: Is the universe infinite, or does it have a limit?3Bill Sloman
6 Feb 26 i `* Re: Is the universe infinite, or does it have a limit?2Jan Panteltje
6 Feb 26 i  `- Re: Is the universe infinite, or does it have a limit?1Bill Sloman
5 Feb 26 +* Re: Is the universe infinite, or does it have a limit?4Martin Brown
5 Feb 26 i`* Re: Is the universe infinite, or does it have a limit?3Jan Panteltje
6 Feb 26 i `* Re: Is the universe infinite, or does it have a limit?2Martin Brown
7 Feb 26 i  `- Re: Is the universe infinite, or does it have a limit?1Jan Panteltje
5 Feb 26 `* Re: Is the universe infinite, or does it have a limit?31Nioclás Pól Caileán de Ghloucester
5 Feb 26  +* Re: Is the universe infinite, or does it have a limit?2john larkin
5 Feb 26  i`- Re: Is the universe infinite, or does it have a limit?1Nioclás Pól Caileán de Ghloucester
6 Feb 26  `* Re: Is the universe infinite, or does it have a limit?28Jan Panteltje
6 Feb 26   +* Re: Is the universe infinite, or does it have a limit?8Bill Sloman
6 Feb 26   i`* Re: Is the universe infinite, or does it have a limit?7Jan Panteltje
6 Feb 26   i `* Re: Is the universe infinite, or does it have a limit?6Bill Sloman
7 Feb 26   i  +* Re: Is the universe infinite, or does it have a limit?2Jan Panteltje
7 Feb 26   i  i`- Re: Is the universe infinite, or does it have a limit?1Bill Sloman
7 Feb 26   i  `* Re: Is the universe infinite, or does it have a limit?3Thomas 'PointedEars' Lahn
7 Feb 26   i   `* Re: Is the universe infinite, or does it have a limit?2Bill Sloman
7 Feb 26   i    `- Re: Is the universe infinite, or does it have a limit?1Thomas 'PointedEars' Lahn
6 Feb 26   `* Re: Is the universe infinite, or does it have a limit?19Nioclás Pól Caileán de Ghloucester
7 Feb 26    `* Re: Is the universe infinite, or does it have a limit?18Thomas 'PointedEars' Lahn
7 Feb 26     `* Re: Is the universe infinite, or does it have a limit?17Nioclás Pól Caileán de Ghloucester
7 Feb 26      `* Re: Is the universe infinite, or does it have a limit?16Thomas 'PointedEars' Lahn
7 Feb 26       +* Re: Is the universe infinite, or does it have a limit?2john larkin
7 Feb 26       i`- Re: Is the universe infinite, or does it have a limit?1Thomas 'PointedEars' Lahn
7 Feb 26       +- Re: Is the universe infinite, or does it have a limit?1Thomas 'PointedEars' Lahn
8 Feb 26       +* Re: Is the universe infinite, or does it have a limit?2Nioclás Pól Caileán de Ghloucester
8 Feb 26       i`- Re: Is the universe infinite, or does it have a limit?1Martin Brown
8 Feb 26       `* Re: Is the universe infinite, or does it have a limit?10john larkin
9 Feb 26        +* Re: Is the universe infinite, or does it have a limit?7Thomas 'PointedEars' Lahn
9 Feb 26        i`* Re: Is the universe infinite, or does it have a limit?6john larkin
9 Feb 26        i `* Re: Is the universe infinite, or does it have a limit?5Jeroen Belleman
9 Feb 26        i  +* Re: Is the universe infinite, or does it have a limit?2Jan Panteltje
9 Feb 26        i  i`- Re: Is the universe infinite, or does it have a limit?1Jeroen Belleman
9 Feb 26        i  `* Re: Is the universe infinite, or does it have a limit?2Thomas 'PointedEars' Lahn
9 Feb 26        i   `- Re: Is the universe infinite, or does it have a limit?1Thomas 'PointedEars' Lahn
9 Feb 26        `* Re: Is the universe infinite, or does it have a limit?2Jeroen Belleman
9 Feb 26         `- Re: Is the universe infinite, or does it have a limit?1Thomas 'PointedEars' Lahn

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