# Tag Info

1 vote

### Does mass create space?

Yes, there's more volume with more mass. (However, there's also "less time", therefore, its complicated with spacetime) Let's assume the Schwarzschild-metric with Schwarzschild-coordinates ...
Accepted

### Why is the ring in this simulation of Sgr A* off center?

The photon ring around a non-spinning Schwarzschild black hole is perfectly circular and centered on the black hole. The photon ring around a spinning Kerr black hole is almost circular (except for ...
• 114k

### Why is the ring in this simulation of Sgr A* off center?

The folder with the video this image comes from has a google docs document with captions and credits. The caption for this video reads "A video demonstrating the effect of inclination on the ...
• 10.7k

### If light has no mass, why is it affected by gravity?

Interestingly light or photons do not (according to theory) have “rest mass” ie no mass at rest. But when it is moving (photons are never at rest) they do have mass given by E = mc2 = hν ⇒ m = E/c2 = ...
• 171
1 vote

### Do relativistically measured rotation speeds (Special Relativity) change planetary mass slightly through Lorentz transformation?

No. The idea of relativistic mass is an outdated concept. There are many questions over on the Physics Stack Exchange about this. Mass is an invariant quantity in GR and SR. It does not change due to ...
• 555
A single vector equation like $\vec{F} = m \frac{d^2 \vec{r}}{dt^2}$ is actually three equations one for each of the $x,y,z$ components of the 3-vector $\vec{r}$. In the spacetime of general ...