Jonah Thorsson

1 minute ago, joigus said:

The notion of curvature in Einstein's GR is intrinsic, so you would detect it by moving on it without aid from any external projection. You walk around trying to move as straight at possible and you get back to the same point? => It is curved.

You walk around along two different perpendicular paths in reverse order and you end up in different points? Example 10º north, then 10º east vs 10º east then 10º north. => different end points => It is curved.

Curvature is an intrinsic property.

Right, so wouldn't light moving in curved space appear curved even though it's travelling as straight as possible? Is light somehow immune to the effects of curved space due to it's having no mass?

Are there any sufficiently massive disk-like objects in our known universe? The way I understand it, for an object to remain flat or disk-like it would have to be not very massive. Is that correct?

Well in a way, wouldn't it be kinda hard to tell the difference? 

Really man, I'm not such an ignoramus that I don't know what gravity is 😆

My point though is that wouldn't those 'spherical' masses actually be FLAT masses in a curved, spherical space

Wouldn't it be impossible for any object of sufficient mass to be technically 'flat', as it would curve space? Am I wrong here?

Is there an equation which is used to determine the amount of lensing? If the amount of lensing from something as massive as the sun is difficult to measure, I imagine that the gravitation's effect on light is there but quite small?

edit: NM I found this myself

Hello everyone, I'm a normal guy with an interest in science but no real knowledge of physics (think Bob Lazar) and I'm looking for people who are smarter than I am to answer questions I have about the universe and make me feel all warm inside. First off I would like to say I'm not a flat earther by any stretch, but one of the most common critiques of flat earth theory is that photos from high altitude clearly show a curvature of the Earth. According to general relativity however, wouldn't the Earth from far enough away appear curved even if it were flat, due to gravitational lensing?