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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.

Philip A. Stahl

I specialize in stellar and solar astrophysics. Can answer questions pertaining to these areas, including: stellar structure and evolution, HR diagrams, binary systems, collapsars (black holes, neutron stars) stellar atmospheres and the spectroscopic analysis of stars as well as the magnetohydrodynamics of sunspots and solar flares. Sorry No homework problems done or research projects! I will provide hints on solutions. No nonsense questions accepted, i.e. pertaining to astrology, or 'UFOs' or overly speculative questions: 'traveling through or near black holes, worm holes, time travel etc. Absolutely NO questions based on the twaddle at this Canadian site: purporting to show a "new physics". Do not waste my time or yours by wasting bandwidith with reference to such bunkum.

James Gort

On Vacation
returns 12/31/2016
Questions on observational astronomy, optics, and astrophysics. Specializing in the evolution of stars, variable stars, supernovae, neuton stars/pulsars, black holes, quasars, and cosmology.

Recent Answers

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

2016-10-25 Inflation & the multiverse:

Hello, and thanks for your question.    First, let me point out that the "multiverse" remains a reasonably informed conjecture more than a theory or even hypothesis.  A hypothesis, for example, must at

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

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