7k views

### Do two beams of light attract each other in general theory of relativity?

In general relativity, light is subject to gravitational pull. Does light generate gravitational pull, and do two beams of light attract each other?
10k views

### Has gravity ever been experimentally measured between two atoms?

Has there been any experiments, or are there any references, demonstrating gravity between atoms? If so, what are the key experiments/papers? Or if not, what is the smallest thing that has actually ...
336 views

### Would Newton law of gravity be the same between two neutrons at smaller distance? [closed]

Imagine 2 neutrons placed at some distance apart, they should only gravitationally attract each other according to Newton law of gravity. Theoretically the law should work at smaller distance until ...
759 views

### How much of the electric force between an electron and proton is in fact gravitational force?

Both electrons and protons have mass, so it is easy to conclude that they exert a gravitational pull on each other. But also, they are charged, so an electrical force is applied. Would we expect a "...
405 views

### What is the smallest particle exhibiting gravitational properties?

I've long been taught that all matter having mass, possesses attractive forces somewhat akin to gravity. As such, imagine we can 'teleport' a gravitonic detection device that can accurately measure ...
376 views

### Does gravity exist between quarks in a neutron?

Does gravity exist between quarks in a neutron? I mean, I've learned that gravity exists between objects that have mass/energy. But does this apply between quarks in a neutron?
206 views

### Largest item experiencing electromagnetic forces that are stronger than gravity

On the large scale, gravity is much stronger than electromagnetic force. But in what cases was the electromagnetic force stronger than gravity on the large scale i.e. objects of the size of the Earth, ...
119 views

### Newtons law of gravity universal?

Im a bit puzzled about the video from “One Minute Physics” claiming that Newtons law of gravity is not universal, but breaks down on very heavy objects and are not really confirmed on very light ones. ...
1k views

### Gravitational constant, $G$, What if it is not Constant?

The question is on title; What if Gravitational Constant, $G$, is not constant? Let's skip all the local consequences if it would suddenly change, like asked here; Can gravitational constant be ...
73 views

### What quantum effects that involve gravity can be studied without stuff like QFT or string theory?

So there is no a full quantum theory of gravitation. However, there are instances where quantum effects due to gravitation have been studied. Like Gravitational neutron interferometry https://arxiv....
77 views

### If Earth was split into thousands of astroid-size chucks, would any of them have gravity? [closed]

I know that mass increases gravity and that less mass decreases gravity. But is there a minimum gravity amount that won't let meteors or astroids have gravity because of their littler masses?
### Detection limits on 'd' if gravity force was proportional to $1 / (R+d)^2$
Assume the force of gravity is proportional to $1/(R+d)^2$ where $d$ is sufficiently small, then, how small would $d$ have to be to evade detection by modern experiments? My thinking is that if $d$ ...