How do you know what you 'know'?


If they are like most scientists,they "know" it only because someone else told them so, from a textbook source, which itself may or may not be correct.

How do you know what you 'know'?


If they are like most scientists,they "know" it only because someone else told them so, from a textbook source, which itself may or may not be correct.

I seem to recall testing much of what we were learning in books in various science labs in school. All of science is testable to anybody willing to make the effort.

"All of science is testable to anybody willing to make the effort."
And spend a few billion!

"All of science is testable to anybody willing to make the effort."
And spend a few billion!

Yup. My school spent billions on each and every student. But seriously, there is a lot of science between the invention of fire and the LHC. Most science can be done for a reasonable price.

You don't need to do all the experiments already done to know if stuff works. Science builds on itself, getting more refined the higher you go. If something at a higher level works it implies that the stuff below also works.
You can prove QM & GR simply by checking if your mobile phone is operational, that should be proof enough for any rational person.

The edge of the observable Universe is about 13.8 billion light years that way. But it's also 13.8 billion light years that way. And that way, and that way.


No it isn't, it is now 46 billion light years away, the light from it has been travelling for 13.8 billion years but the universe has expanded a thousand-fold since the CMBR was emitted.

If your really want to know where we are in relation to the neighbourhood, watch this video:

http://irfu.cea.fr/cosmography

And cosmologists think that if you travel in any direction long enough, you'll return to your starting point, just like how you can travel in any one direction on the surface of the Earth and return right back at your starting point.


While that is a possibility, cosmologists also think that the universe could be infinite. And so far we have not detected any cosmological curvature, indicating that it is either extremely large or infinite.

http://map.gsfc.n...ape.html

If you go out there far enough you will not do something because it is not doable, and that is bumping into nothing, because you can't bump into nothing, which doesn't exist, and which isn't there, because it is nothing. You will find the creation front, however, where time, space, and matter are creating in this expanding universe for perpetuity because there lies the beginning, which astronomers keep trying to find when they peer through their telescopes, but it is too far away to ever see and it just keeps moving farther away in any event, creating from nothing.

The idea that you will end up where you started if you go out far enough is just nuts, because you will always be moving farther away. Always.

The reason he said we are dead center of the universe is because he is using the same perverse logic that people thought the sun and stars and other planets revolved around earth, because it was how you perceive it to be. Since you cant see past the visible edge of the universe of course you appear to be in the center, its the center of all you can see.

And THIS is Relativity...