btaf45
@btaf45@lemmy.world
- ‘Oldest wooden structure’ discovered on border of Zambia and Tanzania. Logs shaped with sharp tools on border of river predate rise of modern humans.www.theguardian.com ↗Submitted 3 days ago to anthropology@mander.xyz | 0 comments
- Submitted 4 days ago to astronomy@mander.xyz | 9 comments
- Submitted 4 days ago to astronomy@mander.xyz | 1 comment
- Comment on X will charge users ‘a small monthly payment’ to use its service:
If Musk wants me to use his shitty crap site, I will be charging him a small monthly fee.
- Submitted 5 days ago to astronomy@mander.xyz | 0 comments
- Comment on Astronomers spot the first “bounce” in our Universe:
It’s not a consensus at all. The reason why the FLRW model does not include modelling boundaries is because it is very hard to model boundaries, not because they are unlikely.
en.wikipedia.org/wiki/Shape_of_the_universe
Assuming a finite universe, the universe can either have an edge or no edge. Many finite mathematical spaces, e.g., a disc, have an edge or boundary. Spaces that have an edge are difficult to treat, both conceptually and mathematically. Namely, it is very difficult to state what would happen at the edge of such a universe. For this reason, spaces that have an edge are typically excluded from consideration.
to respond to your pocket universe theory,
It’s not my “pocket universe theory”. It is the theory of Infinite Inflation, the most popular version of the standard model.
That doesn’t mean there can’t be other universes though.
Those “pocket universes” are not really other universes. They are physically connected to our universe. They are called pocket universes because they are too far away to communicated with. The depiction I showed you is not an abstraction, it is what is believed to be the actual geometric shape.
- Comment on Astronomers spot the first “bounce” in our Universe:
These days those assumptions are considered pretty fundamental
Nope. The reason why the FLRW model does not include modelling boundaries is because it is very hard to model boundaries, not because they are unlikely.
en.wikipedia.org/wiki/Shape_of_the_universe
The reason a “flat” universe does not have boundaries is because none of the 3 curvature possibilities in the FLRW model have boundaries.
[For example, in the Friedmann–Lemaître–Robertson–Walker (FLRW) model, the universe is considered to be without boundaries…]
[Many finite mathematical spaces, e.g., a disc, have an edge or boundary. Spaces that have an edge are difficult to treat, both conceptually and mathematically. Namely, it is very difficult to state what would happen at the edge of such a universe. For this reason, spaces that have an edge are typically excluded from consideration.]
Conclusion: The primary reason why an apparent “flat” universe could still have boundaries is because the FLRW model is either incomplete or possibly even not the right model.
- Comment on Astronomers spot the first “bounce” in our Universe:
The universe was infinite with no edges when the big bang occurred, just like now.
We don’t know that. Here is a depiction of infinite inflation, the most popular version of the standard model, spawning pocket universes with boundaries.
- Comment on Astronomers spot the first “bounce” in our Universe:
if the technique could ever be used to pinpoint the ‘origin’ of the big bang?
There probably was no “origin point” because there was no singularity at the beginning of the big bang. The full universe may have been huge or even been infinite in size and even the observable universe had a significant size. There perhaps was a geographic center though, then and now.
Still, knowing the origin point would probably help pinpoint our own location within the universe and provide better measurements for the age of the things we see in every direction.
That would be the least of it. Knowing where a geographic center or boundary was would allow us to track absolute and not just relative motion. Then we could see what if any special properties apply to an absolute frame of reference.
- Submitted 1 week ago to astronomy@mander.xyz | 11 comments
- Comment on This one-page calendar will change how you view the year:
Not complicated to me. I keep a version in my wallet that I’m going to use every time I have to sign and date a document.
- Comment on They’ve grown up online. So why are our kids not better at detecting misinformation?:
There maybe a correlation at some level, because you cant critically think about a medium without any exposure.
On the flip side, there is also a counter correlation. Younger people do not have a lifetime of background memories to compare things to. If they hear a politician is “corrupt”, they have little idea how it compares to others on the scale between grave and trivial. And if judging if a president is good or bad, they don’t know how to compare them to previous presidents.
- Comment on Microsoft is killing WordPad in Windows after 28 years:
it will deprecate WordPad with a future Windows update as it’s no longer under active development
It doesn’t need “active development” because it is perfect the way it is. Unix/Linux has tons of useful programs that haven’t been in active development for 40-50 years.
- Comment on Buyers of Bored Ape NFTs sue after digital apes turn out to be bad investment:
[Bored Ape NFTs can now be purchased for just $50,000 each.]
You can also buy my special doodles for $12 million each.
- Comment on Why They Hate The USA: CUBA | Hakim:
Didn’t have time to watch it. Do they hate us because we liberated Cuba from Spanish rule which would have been better than Communism?
- Comment on This one-page calendar will change how you view the year:
That was ridiculously complicated. What I did is memorize the month columns in Dr. Siegel’s universal calendar. Now I can figure out any calendar day in my head.
- Submitted 5 weeks ago to general@lemmy.world | 24 comments
- Submitted 5 weeks ago to general@lemmy.world | 10 comments
- Comment on What happens when you open a terminal and enter ‘ls’:
Unix loves to fork processes. So you get lots and lots of processes.
- Comment on The Fear Of AI Just Killed A Very Useful Tool:
A tool that counts “total words”.
That was a Unix program written 50 years ago called “wc”, which stands for “word count”.
- Comment on Programmer's Credo:
I literally use vi/vim for everything that I can. I would use it for gmail if there was a way.
- Comment on “Absurd”: Google, Amazon rebuked over unsupported Chromebooks still for sale:
Can’t you still load new versions of ChromeOS yourself?
I never liked the “forced upgrade of your OS” anyway. Not for windows or Chrome. It was annoying when ChromeOS kept forcefully insisting I upgrade my Linux when I already had Linux exactly how I wanted it.
- Comment on Bram Moolenaar, creator of Vim, has died:
Well that sucks. At least Bill Joy, creator of VI, is still with us.
- Comment on has lemmy.world been going down these past few days or is it the app I use?:
That is a handy site
