Mature galaxies from the dawn of time
"We expected only to find tiny, young, baby galaxies at this point in time, but we've discovered galaxies as mature as our own in what was previously understood to be the dawn of the universe," Leja added.
So does this mean Dark Matter is wrong and MoND is right? Or are there some things Dark matter gets right and MoND gets wrong and we need a third theory to bridge the two?
I just read this morning that a researcher was able to make light slow down to 17 mph and stop completely.
Researchers now able to stop, restart light — Harvard Gazette
Two years ago we slowed it down to 38 miles an hour now weve been able to park it then bring it back up to full speed. Lene Hau isnt talking about a used motorbike, but about light &mdash that ethereal, life-sustaining stuff that normally travels 93 million miles from the sun in about eight minutes.news.harvard.edu
I wonder how practical it will be if it is running at 0.000 000 001 K.I'm betting that Harvard engineers have used the results to begin a new R&D effort here for quantum computing..
Thank you, this is helpful context!Worth remembering that the speed of light is constant in a vacuum. It slows down by about a thirds when travelling through glass. That is not to say this is not an incredible achievement, but it is not breaking the laws of science as we know them.
I wonder how practical it will be if it is running at 0.000 000 001 K.
I remember reading about ^this^ not too long ago. Here is what one of the physicists has to say:
It's cool - literally.
( gotta love that laboratory! )
I'm betting that Harvard engineers have used the results to begin a new R&D effort here for quantum computing.
_______
.
A possible explanation maybe time passed slower near the beginning? We know passage of time is relative. In the movie Interstellar, 1 hour on Miller's planet near the black hole Gargantua is 7 years on earth. Say you're on Miller's planet and had a Zoom call with someone on earth. An hour later you do another Zoom and that person could have aged noticeably.
Thanks, I'm not familiar with that concept but interesting.Hi vbj -
Are you familiar with the cosmological principle where at any given time and at very, very large scales, the universe is treated as an essentially homogeneous and isotropic system? This principle has been validated through deep observations of our universe as shown in the image below*:
View attachment 3973
As one can see, the distribution of galaxies appears to be statistically homogeneous and isotropic at very, very large scales.
When observing a distant object like the distant galaxies in the OP and then mathematically projecting a spherical shell with a radius r at any given time from the origin to the galaxy, the cosmological principle requires that all of the shells expand in an identical fashion within spacetime.
- Here is a diagram showing the concept:
View attachment 3974
In an expanding universe the positions of two points that are recorded at the same time supply meaning to the word separation. This is where the shell's comoving coordinate supplies meaning in relativistic cosmology for an isotropic homogeneous universe. The expansion of spacetime affects all geometric parameters of the universe in an identical fashion.
Relativistic effects occur when an object is close to an event horizon near a powerful gravitational well such as a black hole, or when an object is moving very near the speed of light. When objects are near a black hole their shapes change and gravity literally shreds their existence apart. It is hear where time begins to lose meaning.
________________
* Reference: Tipler, "Modern Physics fifth ed.", W. H. Freeman and Company, 2008, P. 662 and P. 665
Thanks, I'm not familiar with that concept but interesting.