[removed]

[removed]

[removed]

[removed]

In short, no, this has been proposed before.

The current rate of expansion of the universe would mean that the universe keeps expanding forever. There is not enough gravity/mass in the observable universe to make it collapse into itself.

Also, dark energy is increasing the expansion rate. The most likely scenario is called Heat Death.

What you described is normally referred as Big Crunch.

Another common one in California, Oregon, and Washington are hybrids between mule deer and blacktail deer which are fertile. More rarely, in places where both species occur, hybrids of whitetails and mule deer occur.

[removed]

[removed]

Do we know that the early universe wasn’t uniformly dense because of, like, mathematical laws, or is it an inference we make from the fact that it is currently not uniformly dense and therefore must not have started that way?

Those are still dangerous, actually.

Not as much, obviously, but still.

Failure rates are determined during clinical trials in smaller populations where they also survey compliance to use of the contraceptives and factors that affect compliance. So these rates are obviously not completely accurate in all populations/contexts.

The failure rate is the difference between the expected number of pregnancies (per 100 people) with no contraceptives and the expected number of pregancies (per 100 people) correctly using that contraceptive. The efficacy rate is 100 minus the failure rate.

So a failure rate of 2% means an efficacy rate of 98%.

Completely normal. Even hybrid bears have been known (polar bear x grizzly). The Dingo population in Australia is suffering because they mix with feral dogs. It made the news when a 100% pure Dingo puppy (of a certain sub species) was found, he is now fathering little Dingos to help the species. Other animals also sometimes mix. I guess we never notice most hybrids as they either stand out and are preyed upon or just are not seen because it's obviously impossible to monitor this everywhere at all times.

Note to self: If ever face to face with a Zebra in the wild, make sure it's a horse's stripy cousin.

With the changing climate Polar Bears have extended their range to the south and Grizzly Bears to the north, creating some overlap and some hanky Panay.

The result is known variously as Grolar, Pizzly, Zebra, Grizzlar or Nanaluk bears.

[removed]

Yes, it's actually a pretty standard avenue toward speciation, aka the recognition of a new species https://en.wikipedia.org/wiki/Hybrid_speciation

It's more common in plants but it happens in animals as well. Hybrid animals actually can sometimes reproduce (that's how they can become a new species, after all), depending on the genetic qualities of the parents. Ligers (lion-tigers) are fertile and can mate with other ligers, tigers, or lions. The well-known example of the sterile mule is due to the fact that horses and donkeys donate 32 and 31 chromosomes to their offspring, respectively, so the child of a donkey-horse pairing (a mule) will have an odd number of chromosomes, leaving them unable to reproduce.

[removed]

[removed]

A bit late but I’ve pondered this question before and finally there’s a relevant thread to ask and maybe have an answer.

Does this mean that over time the denser regions become denser (attracting matter around them constantly) to the point where the entirety of the universe becomes a dense point which condenses into an infinitely massive black hole? Which then collapses and causes a big bang event.

What I’m saying for a while Ive been thinking that the big bang isn’t the creation event. There is no specific “creation” event. The universe expands and then shrinks recursively, forever over trillenia. When it shrinks all life is erased and then life restarts once big bang occurs and galaxies reform.

This is a very interesting relevant article:

https://www.scirp.org/journal/paperinformation.aspx?paperid=80777

[removed]

[removed]

[removed]

[deleted]

Given the sheer SIZE of supermassive black holes and how quickly the formed post the big bang it seems there are great odds of SMBHs coming from some MEGA big stars that collapsed very quickly. Problem is to my knowledge we've never observed a star big enough to collapse INTO a supermassive black hole.

https://phys.org/news/2021-03-massive-stars-early-universe-progenitors.html#:~:text=The%20leading%20theory%20suggests%20the,into%20supermassive%20black%20holes%20today.

We would have to look back far enough to a now VERY distant galaxy to observe such a massive stars collapsing and merging. Hopefully JWST can confirm them!!

Regarding black hole stars: https://www.youtube.com/watch?v=aeWyp2vXxqA&t=609s

I think black hole stars could well be the origin of some of the supermassive black holes if a whole bunch could smash together!

[removed]