Is the concept of the universe being a never-ending circle, where everything eventually returns to its starting point, a valid theory?

Is the concept of the universe being a never-ending circle, where everything eventually returns to its starting point, a valid theory?   [[Cosmic Theory] Cosmic Theory • 16.5K followers A space about all kinds of cosmic and some related theories about space itself.](   [Wallace Mayo]( [Wallace Mayo]( Masters from Florida State University (1995) [Posted Jan 21]( [Is the concept of the universe being a never-ending circle, where everything eventually returns to its starting point, a valid theory?]( This will contest some other answers. And I’m sorry, they’re just wrong. I’m just going to directly answer this question, and then tell you clearly why. This has been looked... [Read more »](     [James Stewart]( [James Stewart]( former Dental Officer/Medic, USNR (1972-2020) [Posted Sun]( [The end of the universe.]( [What will happen when all the hydrogen in the universe is converted to helium or heavier elements?]( The Big Bang originally produce about 75% hydrogen and 25% helium. That is pretty much it. The stars make up about 10% of the “regular” matter in the universe, the rest being... [Read more »](     [James Stewart]( [James Stewart]( former Dental Officer/Medic, USNR (1972-2020) [Posted Mon]( [The origin of causes in the universe.]( The origin of causes in the universe. [Read more »](   [Read more in Cosmic Theory]() This email was sent by Quora (605 Castro Street, Mountain View, CA 94041). You were sent this email because you might like [Cosmic Theory](). If you don't want these updates anymore, you can [mute Cosmic Theory]( or [unsubscribe](.