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age 66
visits member for 3 years, 7 months
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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.


1d
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.
1d
revised What is the implication of an expanding universe on a small scale?
Further explain why earth sun distance does not change.
2d
revised What is the implication of an expanding universe on a small scale?
corrected grammar and meaning
2d
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.
Oct
27
accepted Is String Theory formulated in flat or curved spacetime?
Oct
6
awarded  Yearling
Sep
30
awarded  Explainer
Sep
24
awarded  Autobiographer
Aug
23
comment Why does space expansion not expand matter?
@babou - If there is no accelerated expansion, I don't think you can extract an unlimited amount of energy, but I might be wrong.
Jul
2
awarded  Curious
Jul
1
reviewed Approve Radioactive decay law and the exponential model, is it always valid?
Jun
28
awarded  Nice Question
Jun
25
reviewed Approve Are there massless bosons at scales above electroweak scale?