Is This Fire Chemistry Boo Sell

[Rhawkins5555]

The movement of the sun comes from the light in the sun it comes from a heavy light that comes from the air it makes its way though the sun it has a straight sun

[jim360]

On the train so can't really type fast enough to rebut everything TD is saying but let's just assume that I typed a really long lecture about how light doesn't travel in straight lines but along geodesics, and how diffraction is really just an effect of interference and so happens all the time.

[Zacs-Master]

He'd probably disappear to another thread and start spouting untruths there instead.

[TheDevil]

"light doesn't travel in straight lines but along geodesics"

Prove it. I'll disprove it, IE, sunsets. If light bent along geodesics then surely the sun wouldn't set? Or, surely instead of getting dark it just got a bit darker.

[TheDevil]

And anyhow Jim, that still doesn't dissolve the fact that light travels in straight lines. Because in theory a geodesic is actually a straight line.

[jim360]

Geodesics in General Relativity.

[jim360]

Also, that's a bad definition of geodesic. Geodesics aren't necessarily straight.

[Zacs-Master]

Are we going to get into non-zero energy-momentum tensors? BTW they're actually 'null-geodesics'.

[TheDevil]

That's going off the fabric of time theory. If that's the case, then the sphere will be a solid object with a lot of mass. Light won't be able to go through the sphere.

[TheDevil]

"Geodesics aren't necessarily straight."

In theory.

[Zacs-Master]

Do you mean the fabric of space-time theory? I don't think there's a theory on the fabric of time itself.

[jim360]

You can't just say "in theory" and pretend that you're being somehow profound.

[TheDevil]

A simple experiment can be done. Get a lazer pen. Turn off the lights.

stand at one end of the room facing the other end of the room with a white baloon in the middle.

Shine the lazer at the wall. You'll notice a nice straight line.

Then, shine the lazer right next to, if you can get half the lazer on the balloon and half the lazer on the wall.

At no point with the lazer beam "bend".

You can diffract it, but at no point does the light bend.

That's my point. Light doesn't bend. And it doesn't.

Yes, when looking at massive stars tousands of light years away, light can appear to be bent, but maybe that's just how we're seeing it. Maybe it's not actually bending? And that's highly likely because when you experminet on earth like how I tried to explain just above regarding lazers and baloons, we can't replicate this bend.

So, why would we just assume that light can bent around massive masses (when light isn't affected by gravity) because when we try to replicate it we can't?

Surely we can only go from what we can prove rather than what appears to be the case, thousands of light years away?

[TheDevil]

"You can't just say "in theory" and pretend that you're being somehow profound."

It's not at all profound to say light travels in straight lines. In fact, it'd be scientifically correct.

[jim360]

While I'm thinking about it, you don't even need to invoke relativity to break the "light travels in straight lines" argument. Mirages are another case where light is bent, more or less continuously, owing to a temperature gradient.

If you'd just stuck to "light tries to travel in as straight a line as possible" then there'd be no argument, as that's the foundation of geometric optics. But it's simply incomplete, and therefore wrong, to say that light travels in straight lines in such a dogmatic way.

[Zacs-Master]

'At no point with the lazer beam "bend"'

Yes it will, we just can't see it as the gravitational mass of the balloon is so small the movement will be infinitesimal.

Light does bend as in Gravitational lensing. The star or planet has much more gravitational mass, therefore it's observable.

[TheDevil]

How can gravity affect something with with no mas, Zacs?

We can visually see how the electromagnetic field can distort light, the Northern Lights for example, but how can gravity?

[bookbinder]

This person has been suspended. Further discussion has no point.

[TheDevil]

That's just not true though because I'm enjoying this discussion and if Jim or Zacs weren't then they would leave.

It's healthy to discuss things through.

[Zacs-Master]

How can gravity affect something with with no mas, Zacs?

https://www.forbes.com/sites/quora/2017/11/22/why-is-light-affected-by-gravity/#1f4832bb11ce

[TheDevil]

So the light travels via geodesics and the geodesics are affected by gravity?


Also I need to state... When something is refracted it's not bent. If the direction changes that doesn't mean the ray of light is being bent.