> the finding will allow other researchers to more precisely calculate the Hubble constant
How would a compound lens lead to a better estimate of the expansion rate of the universe?
replies(2):
Our most powerful telescopes can see "back in time", by looking at stuff far enough away that it took nearly the entire age of the universe for the light to reach us.
I would guess that we can use this natural compound lens to "see farther" with our current telescopes than we might otherwise be able to see.
Our current best telescope, the JWST, can almost see to the very beginning of when it was possible to see, somewhere between 300k and 200M years after the big bang [0].
Somewhere in this time period, the universe cooled enough for normal matter to form.
The JWST still cannot see the actual 'edge' of when this occurred.
Maybe with this natural compound lens, we can see all the way to the edge.
And if we could see where the edge actually is, then maybe we can refine the estimate to a tighter range than [300k,200M], which would give us a better estimate of the expansion rate of the earlier universe.
[0] https://www.universetoday.com/168872/webb-observations-shed-...