* FAQ entries are slowly being migrated to the Insights blog(adsbygoogle = window.adsbygoogle || []).push({});

https://www.physicsforums.com/insights/category/faqs/

Feel free to request future FAQs

- Do photons have mass?
- Will All Matter Be Converted to Photons?

- Does gravity gravitate?
- A Geometrical View of Time Dilation and the Twin Paradox

- Can I send a signal faster than light by pushing a rigid rod?
- Why is the speed of light the same in all frames of reference?
- Rest frame of a photon
- Speed of gravity: How fast do changes in the gravitational field propagate?
- How can light have momentum if it has zero mass?
- Why are massless photons affected by gravity?
- Why does c have a particular value, and can it change?
- What is the Bell spaceship paradox, and how is it resolved?
- What is time dilation
- What is the PF's policy on Lorentz Ether Theory and Block Universe?
- What is the Lorentz transformation
- What is the Mass–energy equivalence
- What is a Metric Tensor
- What are the Einstein field equations
- What is geodesic deviation
- What is relativistic mass and why it is not used much?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Relativity FAQ List

Have something to add?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**