You are here:

Astrophysics/Expert Profile

Ask A Question

Dr. Stephen O. Nelson


Fusion, solar flares, cosmic rays, radiation in space, and stellar physics questions. Generally, nuclear-related astrophysics, but I can usually point you in the right direction if it's not nuclear-related or if it's nuclear but not astrophysics.

Experience in the area

Just moved from being a physics professor at the University of Texas of the Permian Basin into government work. Doctoral dissertation was on a reaction in CNO-cycle fusion, worked in gamma-ray astronomy in the space science division of the naval research laboratory in the high-energy space environment branch.


Government work as a physical scientist with a nuclear focus.


Ph.D. in physics, research was on nuclear fusion reactions important in stellar fusion, further work on space telescope technology.

Average Ratings

Recent Answers from Dr. Stephen O. Nelson

2017-03-22 Question about the color of sunlight:

Sorry for the delay, I was overseas.  Sunlight peaks at around the yellow-green region of the spectrum if you look at its power per unit wavelength, but its peak power output is a little lower if you plot

2016-12-01 superfluidity:

Superfluidity is a state where a fluid can flow with no viscosity,  like liquid helium below 4 Kelvin.  Normal fluids need work to pump against viscous resistance due to molecular collisions, like water

2016-09-30 big bang:

Wow...that is not a theory.  Theories are actually backed by math and predictions, not just words and percentages.  That's more like...politics.  And no, that's not even in the same weight class as a real

2016-09-24 big bang:

The word "singularity" implies that the laws of physics break down and we don't know what that really is.  So to even ask this question is kind of pointless, because we don't understand the nature of a

2016-07-09 Earth obrit:

The Earth is moving around the Sun due to the curvature of space.  The planets are slowly moving slightly further away from the Sun, in fact:


Ask A Question


All Answers

Answers by Expert:

Ask Experts


©2017 All rights reserved.