What if Einstein is wrong about gravity?

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#82
I have no problem understanding what I'm observing in the animations. What I have trouble with is the terminology and it's assigned context.

So driving a car in a circle causes it to 'rotate' 360deg.? A model plane on a tether is rotating as well as revolving?
 
#83
If a car is pointing one detection and does not change its heading if you move the car in a circle around the earth you will have seen all sides of the car from the North Pole however the car is not what rotates it is the cars relative position to the viewer on earth.
 
#87
Disco-Pete said:
I have no problem understanding what I'm observing in the animations. What I have trouble with is the terminology and it's assigned context.

So driving a car in a circle causes it to 'rotate' 360deg.? A model plane on a tether is rotating as well as revolving?
Click to expand...
I don't understand your problem anymore...

Yes. Yes. (A rotation around ones axis doesn't necessarily have to be dead centre, its rotation might, as you imply, be offset at a radius)

Maybe the moon "wobbles" a bit - I don't know..

//
 
#88
This is not an issue of arbitrary terminology or perspective, it's physics and the dynamics of motion. That the moon rotates once every 28 days isn't a matter of some peculiar perspective, that rotation is a manifestation of the energy state of the moon as an orbiting body. Similarly you asked if driving a car in a 360 degree circle represents rotation and the answer is of course, Yes! When you turn the steering wheel the tires impart forces into the suspension system that cause it to follow a curved path. Those forces must supply sufficient kinetic energy to both move the car along the path AND to impart the rotational motion to the mass of the car. Consider this...if you are driving the car around a circle and the road surface suddenly were covered with ice what motion does the car follow? It moves tangentially in a straight line off the circle it was following and it continues to rotate due to the stored energy of rotation from the curved path. We call this a spinout!
 
#91
"...that's when it CONTINUES spinning on its axis." (FIFY)

If you are unable to comprehend combined motion (3 axes each allowing for both linear motion along the axis and rotation about the axis) you ain't ready to critique Einstein's work on relativity.
 
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#92
andy2 said:
In order for Einstein to be right, there has to be dark matter but nobody so far has been able to detect dark matter. There are competing theories that modify our understanding of gravity, but they are at best incomplete.

There are situations where dark matters are better suited, whereas others where modified gravity are better suited to explain.

I think it all comes down to our human inability of understanding the worlds. Quantum theory and general gravity are both incomplete.

These two videos serve as a short summary of dark matter vs. modified gravity.

Dark Matter: The Situation has Changed - YouTube

What If Our Understanding of Gravity Is Wrong? - YouTube
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Here's a very interesting documentary which touches on the question asked in the topic of the thread. Made 2004, it fits Sabines video, somehow. Directed by Randall Myers.

https://www.imdb.com/title/tt0851217/
Part 1 featuring:
Geoffrey Burbidge, Halton Arp, Sir Fred Hoyle, Jack Sulentic, John Dobson, Margaret Burbidge, Martin Lopez-Corredoira, Kary B. Mullis

Part 2 featuring:
Anthony Peratt, Kristoffer Rypdal, Eric J. Lerner, Truls Lynne Hansn, Jayant V. Narlikar, Andre Koch Assis, Jean-Claude Pecker
 
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