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Dr. Stephen O. 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.

Philip A. Stahl

U.S.
Available
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: http://members.shaw.ca/warmbeach/FAQ.htm purporting to show a "new physics". Do not waste my time or yours by wasting bandwidith with reference to such bunkum.

Recent Answers

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: https://www.reddit.com/r/askscience/comments/32da98/is_the_earth_getting_slowly_closer_to_the_sun_or/

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