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The most direct evidence for the existence of dark matter, which also invalidates some competing theories like MOND:
originally posted by: BakedCrusader
We don't just "not know" what Dark Matter is, there is no evidence of its existence whatsoever. It's nothing but fantasy, made up to save a model that has unbelievably huge gaps in it and was flawed from the get go.
a team of scientists working with NASA's Chandra X-ray Observatory has found direct evidence that dark matter is as real as the rings around Saturn.
It was beyond our ability to detect in Einstein's lifetime but yes it's true that "his biggest blunder" may not have been a blunder after all since it now appears there's evidence to support the cosmological constant, and this idea meshes conceptually with other theories that the vacuum should have some energy, though a model to predict the correct amount of energy in space remains elusive so we are stuck with experimental measurements. As I said it all boils down to what's supported by experiments. It should seem like less of a blunder now that there's experimental evidence for it, why should that concept be difficult?
originally posted by: BakedCrusader
a reply to: Arbitrageur
Einstein is said to later have called the cosmological constant "the biggest blunder" of his life, but off course that too is now validated by the fantasy of Dark Energy.
If there is phlogiston in metals, and metals lose phlogiston when they burn, how is it that some metals gain mass when they burn?
originally posted by: BakedCrusader
a reply to: Arbitrageur
So if there is an aether like structure, what is Einstein's excuse for "not being able to detect the motion of the Earth with any optical experiment", when the Michelson/Morley showed that the Earth is stationary based on the existence of an aether.
As I said before, Einstein himself provided little proof of his own theories. Other people typically made the observations and experiments which were consistent with his theories, not Einstein himself.
originally posted by: BakedCrusader
And like I asked earlier, what actual proof that the Earth is moving did he base his theory on?
In our everyday life, all waves require a medium to travel in. sound waves, water waves, you name it.
so when it was discovered that light was a wave, and could even travel across a vacuum, there was no medium in the vacuum for the wave to travel in! the ether was proposed to explain this - an invisible fluid-like substance that permeates all the universe, and it is through this fluid that light waves move. essentially the question was: "if light is a wave, what is waving?" the ether was the answer.
ok, so that's all well and good, and nobody knew whether it was true or not for a long time.
However Michelson and Morley did an experiment in 1887 that pretty much showed that there was no ether, and that light therefore could be understood as not requiring a medium. this understanding has been borne out by many other experiments that are consistent with an absence of the ether.
here are some cool pages that explain the essentials of the michelson-morley experiment:
galileoandeinstein.physics.virgin......
scienceworld.wolfram.com...
Light contrasts with sound, which travels through the air (or some other material medium). If you're stationary with respect to the air, then the speed of sound is the same in all directions. But if you're moving with respect to the air, the speed of sound will be the same in all directions relative to the air---which means that sound coming up in front of you will seem faster and sound catching up to you from behind will seem slower.
If light were a disturbance in a medium, it would exhibit the same behavior. But light never does---its speed is the same under all circumstances. So it does you no good to postulate an aether. You can still do it, but it makes the theory more complicated than necessary. The only reason to postulate an aether is that you're uncomfortable with the idea of waves not needing a medium. But our modern understanding of quantum mechanics is that all kinds of particles have a wavelike nature, so, if you accept that matter can travel through empty space, you should have no problem accepting the same for light.
originally posted by: BakedCrusader
a reply to: Arbitrageur
So if there is an aether like structure, what is Einstein's excuse for "not being able to detect the motion of the Earth with any optical experiment", when the Michelson/Morley showed that the Earth is stationary based on the existence of an aether.
originally posted by: BakedCrusader
a reply to: Arbitrageur
So aether doesn't exist is now your answer?
Space has properties, but properties consistent with the theory of general relativity, not consistent with the previously postulated luminiferous aether. Einstein said the properties could be referred to as a "new aether" (different from luminiferous aether) but that term didn't stick which is just as well since by now it's not "new" and we instead call it "space-time".
originally posted by: BakedCrusader
a reply to: Kashai
So the vacuum of space is completely empty then?
Apparently you don't understand the difference between what Einstein referred to as "new aether" and luminiferous aether, but I can assure you they are not the same thing. It seems like you are asking leading questions trying to mix them up but that's flawed reasoning on your part.
originally posted by: BakedCrusader
a reply to: Arbitrageur
So what is it, is space empty, or is it not?