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Philip A. Stahl

U.S.
Available
I specialize in stellar and solar astrophysics. Can answer any questions pertaining to these areas, the spectroscopic analysis of stars – as well as the magneto-hydrodynamics of sunspots and solar flares. Sorry – No homework problems done or research projects! I will provide hints on solutions.

Steve Nelson

U.S.
Available
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.

Recent Answers

2012-02-09 speed of light:

You're invoking impossibility, traveling at the speed of light when you have mass and that would take an infinite amount of energy.  So the question is just wrong to start with.  If you could, as some

2012-01-31 Astonomy / Physics:

Hello,    Okay, let's make it more concrete using the problem below - with the accompanying diagram as a reference.    Problem:    A student draws a sketch with square units in centimeters (Fig. 1) of

2012-01-31 Astonomy / Physics:

Hello,    This sounds suspiciously like a homework problem which I don't do. However, I can provide some assistance to enable you to complete the solution on your own.    The semi-major axis, a, which

2012-01-27 Time dilation and expansion of the universe:

Hello,    You raise an intriguing question and one which, certainly at first glance, appears to have or suggest serious gaps in our perceptions or knowledge, especially regarding cosmic inflation and the

2012-01-12 Ric Ross questioin -infinite gravitational force:

Hello,    "Infinite gravitational force" is kind of a poor description of what's going on. Also, the new M-brane collision theory for the origin of the Big Bang kind of eliminates most discussions of "singularities"

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