This has been a fun thread to read. However, when Galu tried to trick us into believing there are man-made satellites orbiting the Moon and taking pictures in the dark, and sending them back to Earth, well, that's a little "out there". No doubt, that picture is of a computer-generated image and was taken in a low-rent studio somewhere in the backcountry of Bulgaria.
🙂
(I don't post much, but I hang around and am mostly harmless.)
What are those lines? These consist of the lighter coloured rock which was ejected from under the Moon's surface as the craters formed due to the impact of space debris early in the history of the Solar System.
In the low gravity of the Moon, the ejecta could travel great distances.
In the low gravity of the Moon, the ejecta could travel great distances.
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I'm still looking for the flagpoles on the near side! 😉
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Yes, I get that. But some of the lines seem to stretch from one side of the moon to the complete opposite side. I would think that a impact like that would make the debris go out of orbit or something. Really strange that it managed to form such long ridges of rock and dust. Must've taken quite some time for the dust to settle, so to speak.
Don't know about the poles themselves, but the nylon flags may have disintegrated over the years due to the extreme difference in temperature between lunar night and day, not to mention the punishingly high levels of UV radiation.
However, I wouldn't want this thread to descend to the levels of conspiracy theory. Let's stick to real science - there are enough unknowns in cosmology to be getting on with!
Hey, you're building on it. You would think all that low level gravity would have left something...anything, on those pretty highlander pods😉
Forget the flags, just give me more of your science like in the above quote dude! 😉
Has anybody addressed the issue not of expansion but of acceleration? I think that is where most arguments fall flat.
The rate of expansion appears not to be slowing down, but speeding up. This is contrary to the models based on the general theory of relativity. No one is yet sure of which force could be responsible for pushing the universe apart even faster. Lots of hypotheses abound.
We are now pretty certain that the universe will continue to expand at an ever increasing rate. The end game is revealed, but what we don't know is how the universe began and what set it expanding in the first place.
That's my point. I'm into amateur astronomy and after 30 years of Reading Skynews and Sky and Telescope and other publications I can't tell you how many articles have the words, "trying to understand", "scientist think", "promising model", "not all the data is in."
It's against thermodynamic laws, wheres the accelerant?
It's against thermodynamic laws, wheres the accelerant?
I look to you and others to correct me. It just seems logical that anything thrown up with no atmosphere would fall quickly even with relatively weak gravity, no?
Is it completely unrealistic that we happen to be in just the beginning of the BB and that the acceleration has just begun. We think 14b years is along time but maybe we are only in the beginning. A bullet keeps accelerating the whole length of the barrel - but there is only one "push"...
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One would think that gravity would at some point pull the expanding universe back together. Einstein himself was so sure that the universe wasn't expanding that he built a factor into his equations which had the effect of providing an 'antigravity' force that would maintain a static universe.
This 'antigravity' force was not like any other force, but was built in to the fabric of spacetime itself. To permit the existence of this force, Einstein introduced a factor called the 'cosmological constant' into his equations. He later disavowed it, calling it his 'greatest mistake'.
However, given our present knowledge about the expansion of the universe, perhaps Einstein was right about the need for a cosmological constant after all!
So what is Einstein actually responsible for in constructing the current model? I mean those fundamental primary things others have built upon to arrive at where we are now? When did he cease to advance contemporary school of thought? Or did he? Til his end?
In a nutshell please😀
In a nutshell please😀
In 115 years there has not yet been an observation at large scale that is inconsistent with Einstein's relativity.
So was he first to cross the finish line among others or would it have changed the progression of knowledge had he never lived?
Einstein was responsible for formulating the theory of general relativity, a theory about gravity, the mathematics of which predict an expanding universe - although Einstein himself did not accept that and believed the universe to be static. Date of publication 1915.
In 1922, Russian physicist Alaxander Friedmann solved Einstein's equations of general relativity and found they predicted that the universe was not static but expanding.
There are actually three possible types of solutions to Einstein's equations i.e. three differnt models of the expanding universe: 1. expansion slows down, stops and then contracts, 2. expansion is so rapid that gravity can never stop it, though it does slow down a bit, and, 3. expansion is just fast enough to avoid collape and gets smaller, but never reaches zero.
The big problem for present day physicists is that observations suggest that the expansion of the universe is actually accelerating, something which is NOT predicted by the three solutions to Einstein's equations. Physicists do not know what is causing this accelerating expansion and are hypothesising as to what force could be responsible for pushing the universe apart ever faster. Hypotheses such as dark energy have been made, but the truth is we really don't know. We need some new physics, perhaps a quantum theory of gravity to replace Einstein's theory of gravity as expressed in general relativity. Einstein started the ball rolling, but the game is not over!
It's a big nut and I hope I've cracked it! I've mentioned it all before and will not return to it. 😎
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