ExpertAverage RatingsExpertise

Harry Hayfield

Particular expert in eclipses (both solar and lunar), but able to answer most questions about astronomy or refer to a website that can help

Paul Wagner

Astronomy and telescope making. Have made at least seven telescopes, both refractors and reflectors, and have spent 30 years looking at the nighttime sky.

Philip Stahl

I have more than forty years of experience in Astronomy, specifically solar and space physics. My specialties include the physics of solar flares, sunspots, including their effects on Earth and statistics pertaining to sunspot morphology and flare geo-effectiveness.

Patrick Weiler

I`d be pleased to answer questions about any aspect of astronomy, particularly those related to cosmology, astrophysics, and planetary sciences. I can also provide reliable information on unique topics like dark energy, dark matter, black holes, etc.,.

James Gort

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

Courtney Seligman

On Vacation
returns 12/31/2014
I can answer almost any question about astronomy and related sciences, such as physics and geology. I will not answer questions about astrology and similar pseudo-scientific rubbish.

Recent Answers

2014-12-01 quantum physics:

Hi Richard,    Yes, physics must predict experimental results. That's exactly why I have problems with many cosmological theories or even string theory (see Peter Woit's excellent book - "Not Even Wrong")

2014-11-26 quantum physics:

Hi Richard,    First, I apologize for the late answer, but I was out of town.    To answer your question, it seems that a theory does not have to predict EXACT outcomes. In fact, at the micro level, exact

2014-11-19 astrophysics:

Hello,    In answer to your first question, there was no collision with a space rock, the star collapsed on its own and became a neutron star - not a black hole. This neutron star (google) is about 20

2014-11-12 Jason 313 Discoverer Telescope:

HI Laura    That's a bit of a problem.  They don't sell these tripods separately, and there is reason for that--they don't work very well.  But that doesn't mean you are completely out of luck.     One

2014-11-06 reflecting telescope problems:

HI Liz     OK--I have only one other suggestion.  Make sure that you are using the lowest possible magnification when you are looking for/at these objects.  The Orion Nebula is almost the size of the moon

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