Comments on: What is Time/2025/05/16/what-is-time/The goal of this blog is to create a long list of facts that are important, not trivia, and that are known to be true yet are either disputed by large segments of the public or highly surprising or misunderstood by many.Fri, 16 May 2025 18:45:40 +0000hourly1http://wordpress.com/By: luisa zambrotta/2025/05/16/what-is-time/comment-page-1/#comment-3243Fri, 16 May 2025 18:45:40 +0000/?p=2767#comment-3243]]>In reply to thomasstigwikman.

You’re more than welcome 🌹

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]]>By: thomasstigwikman/2025/05/16/what-is-time/comment-page-1/#comment-3242Fri, 16 May 2025 18:31:47 +0000/?p=2767#comment-3242In reply to luisa zambrotta.

Thank you so much Luisa for your kind words.

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]]>By: thomasstigwikman/2025/05/16/what-is-time/comment-page-1/#comment-3241Fri, 16 May 2025 18:31:07 +0000/?p=2767#comment-3241In reply to Jacqui Murray.

That’s an excellent question I only vaguely answered it/them because the book only vaguely answers them too. For the first question, he describes cosmological models for which the Universe (and time) has a beginning and cosmological models for which there are many universes and time has existed infinitely. The book is quite dated, so it is leaning towards the first option whilst recent models and research is leaning towards the latter (as I understand). But reasonable minds disagree.

The second question is that it depends on what you mean by illusion but in general, time is not an illusion. You can maybe say that the universe and all of the time exists all at once as an unchangeable entity and our evolving memories, which is a part of that entity gives the feeling of moving time. But that is a philosophical viewpoint. The arrow of time definitely exists (irreversible processes), so in that sense you cannot say that time is an illusion. However, it should be noted that time does not exist for massless particles like photons.

The answer to the third question is that you can travel forward in time, in fact we already are, but not likely backwards in time. If you can travel backwards in time, then you cannot affect the universe in any way.

Thank you so much Jacqui

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]]>By: luisa zambrotta/2025/05/16/what-is-time/comment-page-1/#comment-3240Fri, 16 May 2025 16:35:35 +0000/?p=2767#comment-3240Great piece, as always, and a wonderful read. Thank you.

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]]>By: Jacqui Murray/2025/05/16/what-is-time/comment-page-1/#comment-3239Fri, 16 May 2025 15:36:19 +0000/?p=2767#comment-3239Time is a tricky concept. Does this book answer the three questions it poses–

* Does the universe have a beginning and an end?

* Is the passage of time merely an illusion?

* Is it possible to travel backward — or forward — in time?

I’ve begun to consider time less linear than I used to so these answers would help. I might even buy the book! Thanks for the intriguing review.

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