6,143 reputation
11238
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age 66
visits member for 3 years, 10 months
seen Jul 26 at 21:20

I have a PhD in physics, but for my career, I worked as a software engineer. In my retirement, I have gone back to my first love, Physics. I attend lots of physics colloquia, seminars, conferences and summer schools mostly in astrophysics, cosmology and particle physics.


Jul
20
awarded  Nice Answer
Jul
17
revised Why do neutrino oscillations imply nonzero neutrino masses?
Added latex
Jun
29
awarded  Nice Answer
Jun
22
awarded  Nice Answer
Jun
10
reviewed Approve How do we know that some radioactive materials have a half life of millions or even billions of years?
Jun
7
answered When an atom is split, what form of energy is released?
Jun
6
revised Why does the electron volt seem inconsistent with mass?
Fixed the question.
Jun
6
revised Why does the electron volt seem inconsistent with mass?
fixed confusion of current with voltage
Jun
3
answered What is the speed of Newtonian gravity?
May
27
comment What is the implication of an expanding universe on a small scale?
I updated the answer to explain this better. The density is the mass per unit volume and since the space is expanding, in a constant unit volume, there will be less mass since the mass will move out beyond the edges of the volume as space expands.
May
27
revised What is the implication of an expanding universe on a small scale?
Further explain why earth sun distance does not change.
May
26
revised What is the implication of an expanding universe on a small scale?
corrected grammar and meaning
May
26
answered What is the implication of an expanding universe on a small scale?
May
24
reviewed Approve Static friction and Kinetic friction
May
24
reviewed Approve Why do planets move in fixed orbits?
May
15
revised Would a collision of two black holes emit any electromagnetic radiation?
spelling correction
Apr
15
awarded  Necromancer
Mar
9
awarded  Enlightened
Mar
9
awarded  Nice Answer
Nov
14
revised How can anything ever fall into a black hole as seen from an outside observer?
Corrected a mistake - there is a LAST photon that will ever be detected by an outside observer.