[fishtank]

Figure 1: Typical rotation curve of a spiral galaxy: Speeds (V) in km/s units as a function of distance from the centre of the galaxy (R) in 1000 light-year (LY) units. The upper curve shows the speeds of the stars in disk region determined from their visible light and the gasses beyond that determined from radio frequency emissions. The lower curve shows what standard Newtonian physics predicts should be observed. The discrepancy is made up by positing the existence of invisible dark matter.

CMI article image and caption

[D Rider]

It could be that Niels Bohr was correct, the universe is electromagnetic.

[backwoods-engineer]

Because fishtank and other young-earth creationists fail to see that real science is constantly refining its models, to ever more closely approximate truth? The truth that God himself has written into the fabric of the universe?

[marktwain]

Why is that even necessary if the current theory describing the evolution of the universe is so correct?

---

Because science does not deal in absolutes?

Because theories are always being revised and refined?

Because theories often explain much, but not everything. What they do not explain results in further refinement.

[minnesota_bound]

Big bang cosmology is correct?
Sheldon Cooper thinks not.
He abandoned physics and went with geology after some derision
https://www.youtube.com/watch?v=3roKKQbIycI

May contain disturbing images of Sheldon in bed....
The Big Bang Theory - Drunk Sheldon and Geology
https://www.youtube.com/watch?v=aOQp3FHOPyQ

[Lisbon1940]

Scientists are always trying to find out about stuff.

[UCANSEE2]

The outer edges of a tornado can reach 100-200 mph, and carry objects like houses, trucks, trains, yet the mass of the 'tornado' itself is very low.

Do tornadoes contain DARK MATTER ?

[Mr. K]

Why do some galaxies look like they are exploding outward (a ball) and some look like they are spiraling inward (like water down a drain)?

This has always been something I noticed. Spiral arms are formed in water down a drain, tornadoes (upside down drain), hurricanes, why would large-scale galaxies be different?

[Red Badger]

They can’t find the Dark Matter because IT’S DARK, duh!..................

[Boogieman]

The simple fact is, the starting conditions for the Big Bang, according to the laws of physics we know from observation and experiment, could never result in a “Big Bang”. Those conditions would instead result in an extraordinarily massive black hole from which nothing could escape.

Scientists have to imagine that the laws of physics must have been different at that time to allow for a “big bang” instead of the usual result. However, that violates uniformitarianism, one of key postulates underlying all of science. Thus, their clinging to this “big bang” hypothesis undercuts just about everything else in science, since if the hypothesis were true, uniformitarianism could not be taken for granted, and all science based on the assumption of uniformitarianism would be put into question.

[Mr. K]

PS only someone ignorant of science would write such an aritcle phrased that way.

All theories are subject to question and change if a new theory proves better.

Big Bang is not true just because it is the current consensus - it is still just a theory.

[PfromHoGro]

Perhaps someone can explain how our observations are affected due to change in the way time is kept by the space between large masses when the masses are moving away or towards each other. We know that time runs “faster” the farther away from mass the time is kept. If two large masses are moving away from each other, the “time-watch” rate in the space between the masses changes- accelerates, or decelerates if the masses are moving away or towards each other.

There’s that Abel super cluster (I forget the catalogue number) that’s used to display a large area of dark matter. Could it be that the space between the masses is just undergoing a large change in the way the space keeps time? And our experience of that phenomenon results in these discrepancies? Maybe I’m not explain that right, or it’s completely idiotic and I’m missing something. But wouldn’t time run “slower” closer to the center of the galaxy than it does out near the outer rim?

[Yo-Yo]

Because God does not play dice with the universe. He created it, but there is no reason why we cannot figure out how it works.

[I want the USA back]

The “Big Bang” is not a sufficient explanation of the origin of the Universe. In other words, it can not be used in order to explain the Universe as we see it. Talking about “dark matter” is just flailing around in the dark.

The first job is to explain where the energy came from that caused the “Universe the size of a pea” to expand to the size of an apple, then to the size of a grapefruit, then to the size of a watermelon, and to its current size.

I would also like to know how it is possible to measure the size of the Universe at its inception, since there can not be an observer standing outside of the Universe with a measuring stick to measure it.

(Obviously it’s not possible.)

[AndyTheBear]

Interesting that the "big bang" standard model is being seen as too secular by some today. For decades after Georges Lemaitre (the Jesuit Priest and Mathematician) proposed it, it was suspected of being a case of religious influence interfering with science because it predicted there was a moment of creation. And of course non-religious people had to think the universe had simply always existed.

Now his theory gets it from the other side. Sometimes you can't win...

[Bratch]

[Salman]

Whoever wrote this doesn’t even understand what science is.

[mlo]

"Why look for a new theory of gravity if the big bang cosmology is correct?"

First, because science is a process not a body of knowledge, and anything can be questioned and possibly improved.

Second, because our theories of gravity and quantum mechanics, while both appearing to be completely accurate, do not overlap. So it is thought that there must be another description of the universe that while consistent with what we understand now, will encompass both gravity and everything else.

"...application of certain non-biblical boundary conditions to the physics of Einstein’s general relativity theory."

What the heck is a "non-biblical boundary condition" is physics? I've never heard of such a scientific term.

[TBP]

Good question.

[TBP]

So what “banged” and where did it come from?

[outofsalt]

I subscribe to the, “Shit Happens” school of cosmology.