ExpertAverage RatingsExpertise

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.

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.,.

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 pertaining to sunspot morphology and flare geo-effectiveness.

Paul Wagner

On Vacation
returns 07/20/2015
Astronomy and telescope making. Have made at least seven telescopes, both refractors and reflectors, and have spent 30 years looking at the nighttime sky.

Recent Answers

2015-06-29 solar flares & gravity:

Hello,    In actual, technical fact gravimetric forces are found throughout space, just at different distances, e.g. from planets. (For example, from any given gravitating mass like Earth it falls off

2015-06-26 Space queries:

I'm not sure what you mean, so will give two possible answers.    (1) If you mean do we know what more than 10% of what is in the Universe is made of, the answer is probably no, since at least 90% of the

2015-06-16 How to defend against WR 104?:

Hello,    When those in the know say a GRB from WR 104 is "coming" they really mean any time from today to 500,000 years from now. That's how much uncertainty is attached to the potential event. For my

2015-05-28 Mars atmosphere:

The scale height on Mars (the change in altitude required to cause a change in atmospheric pressure by a factor of e, or 2.718) is a little less than 7 miles, so the pressure at 7 miles "depth" should

2015-05-25 Moon's travel:

The furthest north the Moon can ever get is about 28 1/2 degrees north of the Celestial Equator, so it can never pass overhead at your location (which would require it to be 41 degrees north of the Celestial

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