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Friday, August 28, 2009

Hubble Ultra Deep Field



Kind of cool, but full of "current scientific thinking". I read somewhere that some scientists had postulated that the universe could not be infinite because if it was, then the night sky would be white from the infinite number of stars. I am not sure I buy that argument. Each star only gives off so much light, and the farther you get from that star the fainter that light becomes until you are only getting an occasional photon from that particular star. So we are down to an infinite number of stars divided by a fixed amount of light times an infinite distance. Whose infinity is bigger? And then there is the business of the speed of light. Popular science flacks like to trot out that old saw about how "nothing can go faster than the speed of light", but that is a crock. There is no absolute velocity. There is no fixed point in the universe against which to measure your speed, so there is no way to tell what your absolute velocity is. It's all relative. All we can measure is our velocity relative to other objects, and our velocity compared to some distant astronomical objects appears to be much higher than the speed of light. The velocity of light relative to any fixed object is always the same: 186,000 miles per second. It does not matter how fast two objects are travelling relative to one another. If one directs a beam of light to the other and both measure the speed of light, it will be the same. This is what Michelson & Morley figured out a hundred years ago. On the other hand, you may have a hard time convincing the two parties that it is indeed the same beam of light because the frequency (or color) of the light will appear to be different to these two guys. 

That is how radar speed guns (used by the police) work: they mix the reflected radar signal with their outgoing signal and if the reflecting object is moving (like a car speeding down the road), these two signal will interfere with each other and produce a third wave at a much lower frequency that can easily be measured. This is where they get the speed measurement.

I don't like the Big Bang theory, it smells too much like creationism. "And the lord said let there be light, and there was light". Besides it's just a theory about what happened umpteen billion years ago, and like who was around back then who could verify our hypothesis one way or the other? Likewise, dark matter sounds a bit feeble, though there could be a large number of black holes lurking out there, throwing confusion into the calculations. And then there is the red shift of light from distant stars and galaxies. "Scientists" tell us that is because the universe is expanding and everything is flying apart. What if that is not the case? What if the light is just getting old and slow? I mean it has travelled a long way, for a really long time. And light is basically a disturbance of the all pervasive electromagnetic field. Maybe when you get a few, or a few million, light years away from a star, the field gets weaker/stronger, or otherwise changes, and it changes the light that comes through it. I find all this speculation about the origin, size and age of the universe just so much blather. It's really big and we haven't discovered the end of it. Whenever we look harder or deeper, we find more. That's nice. Let's send somebody out there to take a look, see if there really is anything out there or not. Maybe the universe is just a giant hollow ball filled with glowing lights, kind of like the Truman Show.

2 comments:

Bishop Ussher said...

Of COURSE there was a Big Bang, specifically in the night preceding 23 October 4004 BC ;-)

Chuck Pergiel said...

I'll drink to that!