John Rennie's user avatar
John Rennie's user avatar
John Rennie's user avatar
John Rennie
  • Member for 11 years, 10 months
  • Last seen this week
374 votes
7 answers
58k views

Did the Big Bang happen at a point?

155 votes
9 answers
36k views

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

104 votes
16 answers
16k views

What is the proper way to explain the twin paradox?

102 votes
11 answers
13k views

How can time dilation be symmetric?

97 votes
9 answers
15k views

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

79 votes
12 answers
12k views

What is time dilation really?

59 votes
4 answers
25k views

Does time move slower at the equator?

54 votes
2 answers
24k views

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

44 votes
2 answers
2k views

Identification of particles and anti-particles

27 votes
2 answers
3k views

Building a wormhole

25 votes
1 answer
2k views

Does light really travel more slowly near a massive body?

24 votes
2 answers
6k views

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

22 votes
6 answers
3k views

Interpretation of a singular metric

22 votes
2 answers
1k views

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

20 votes
1 answer
599 views

Is electron/positron annihilation to two gravitons forbidden?

17 votes
2 answers
2k views

Does an accelerating electric dipole radiate?

16 votes
2 answers
877 views

Could LEP II have discovered a 125GeV Higgs?

10 votes
2 answers
3k views

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

10 votes
3 answers
482 views

How to describe arbitrary accelerations in special relativity

10 votes
4 answers
625 views

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

7 votes
1 answer
409 views

Does a diatomic molecule falling into a black hole dissociate?

4 votes
4 answers
623 views

What makes a coordinate curved?

3 votes
2 answers
266 views

Do bubble universes have a centre?

3 votes
2 answers
235 views

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