John Rennie's user avatar
John Rennie's user avatar
John Rennie's user avatar
John Rennie
  • Member for 13 years, 3 months
  • Last seen this week
397 votes
8 answers
64k views

Did the Big Bang happen at a point?

163 votes
9 answers
40k views

Does someone falling into a black hole see the end of the universe?

108 votes
15 answers
19k views

What is the proper way to explain the twin paradox?

106 votes
12 answers
15k views

How can time dilation be symmetric?

106 votes
10 answers
18k views

What is time, does it flow, and if so what defines its direction?

82 votes
12 answers
14k views

What is time dilation really?

59 votes
4 answers
27k views

Does time move slower at the equator?

55 votes
2 answers
25k views

How long would it take me to travel to a distant star?

45 votes
2 answers
2k views

Identification of particles and anti-particles

27 votes
2 answers
3k views

Building a wormhole

25 votes
2 answers
7k views

How does the Hubble parameter change with the age of the universe?

24 votes
1 answer
2k views

Does light really travel more slowly near a massive body?

23 votes
2 answers
1k views

Does a charged or rotating black hole change the genus of spacetime?

22 votes
6 answers
3k views

Interpretation of a singular metric

20 votes
2 answers
2k views

Does an accelerating electric dipole radiate?

18 votes
1 answer
688 views

Is electron/positron annihilation to two gravitons forbidden?

16 votes
2 answers
939 views

Could LEP II have discovered a 125GeV Higgs?

12 votes
4 answers
1k views

Why are the two outer charge densities on a system of parallel charged plates identical?

11 votes
3 answers
3k views

Does a rotating disk develop a potential difference between the centre and rim?

10 votes
3 answers
546 views

How to describe arbitrary accelerations in special relativity

7 votes
1 answer
441 views

Does a diatomic molecule falling into a black hole dissociate?

4 votes
4 answers
659 views

What makes a coordinate curved?

3 votes
2 answers
295 views

Do bubble universes have a centre?

3 votes
2 answers
254 views

Why is $p_\phi$ conserved in a Schwarzschild orbit?