The discussion centers on the concept of whether the universe, often described as "infinite," can truly have an end if it had a beginning. Some scientists propose the Big Crunch theory, suggesting the universe may eventually collapse back on itself. Others argue for the possibility of an infinite universe that does not have a definitive end. The conversation also touches on the evolution of human theories regarding the universe's fate over thousands of years and the varying definitions of what constitutes an "end." Ultimately, the debate remains open, with no definitive proof yet established about the universe's future.
#1
aricho
71
0
"infinite Galaxy"
If our "infinite" universe had a beginning, it has an end, right?
Do definte proof has been found yet as to the future of the Universe. Some say it will fall back on itself in the 'big crunch' and that would be the end.
#3
Nicool005
4
0
It's a question that has a few possible answers. As AMT said, several scientists believe that our universe will eventually end in what is called the Big Crunch, while some believe it is possible that our universe is infinite. You can read more about the big crunch Here
You can take a more restrictive view of this: what is the best cosmological model today ('best' of course is somewhat up to you to decide)? What does it say re 'an end'?
You can also take a more relaxed view: humans have been developing theories re the 'end of the universe' for, what, a few thousand years? How have our answers changed, over that incredibly short period of time? What can you conclude from humans' views of whether the universe will 'end' or not, in terms of whether it will, *truly* end?
Is a homemade radio telescope realistic?
There seems to be a confluence of multiple technologies that makes the situation better than when I was a wee lad: software-defined radio (SDR), the easy availability of satellite dishes, surveillance drives, and fast CPUs.
Let's take a step back - it is trivial to see the sun in radio. An old analog TV, a set of "rabbit ears" antenna, and you're good to go. Point the antenna at the sun (i.e. the ears are perpendicular to it) and there is...
3I/ATLAS, also known as C/2025 N1 (ATLAS) and formerly designated as A11pl3Z, is an iinterstellar comet. It was discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS) station at Río Hurtado, Chile on 1 July 2025.
Note: it was mentioned (as A11pl3Z) by DaveE in a new member's introductory thread.
https://www.physicsforums.com/threads/brian-cox-lead-me-here.1081670/post-7274146
https://earthsky.org/space/new-interstellar-object-candidate-heading-toward-the-sun-a11pl3z/
One...
Partial solar eclipse from Twizel, South Isl., New Zealand ...
almost missed it due to cloud, didnt see max at 0710 NZST as it went back into cloud.
20250922, 0701NZST
Canon 6D II 70-200mm @200mm,
F4, 100th sec, 1600ISO
Makeshift solar filter made out of solar eclipse sunglasses