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

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 as applied to astronomical investigations.

Tom Whiting

Astronomy has been my hobby/pasttime for over 50 years.  Currently own 3 telescopes, the largest of which is a 30 inch Newtonian truss Dob that is portable.I taught Astronomy/Meteorology at the University Level for 13 years before retiring in 1995. Being retired and home most of the time, I am able to answer all questions relatively quickly, unless it's a new moon weekend with good observing conditions.  No astrology questions please, or questions about alleged UFO picture identifications.

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.

Brad Tucker

I'm happy to answer any general questions about Astronomy, Astrophysics, and Cosmology. I'm also happy to take general, specific, and detailed questions related to supernovae, Baryonic Acoustic Oscillations, the Cosmic Microwave Background, dark matter, dark energy, and the Big Bang Theory. I'm also happy to chat about Astronomy/Astrophysics education and careers, and philosophy and science.

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.

Courtney Seligman

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

2014-04-11 Planet formation:

The key is actually nuclear physics.  In order to get higher order elements (i.e. elements with more protons and neutrons than hydrogen), you need something called neutron capture.  Since most of the gas

2014-04-10 the sun:

The Sun gets its energy through nuclear fusion.  Nuclear fusion is the process of combining two atoms together, creating a new atom but also creating energy in the process.  This is the opposite of nuclear

2014-03-25 Planet formation:

Hi Cole,    This is a great question, one that researchers are working on today.   I do not have a definitive answer as we are not sure of it, but I'll try to shed some light on the question.    Firstly

2014-03-22 limiting magnitude:

Limiting magnitude represents the faintest thing you can see with the instrument you're using and current observing conditions. For instance, "normal" limiting magnitude for naked-eye viewing in a very

2014-03-08 Black Holes & Big Bang:

Hello Ralph,    I sure wish I could answer your question definitively. But I'm in good company. Because no one can.    Please let me break down your question into parts, and I'll address each part:   

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