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

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.,.

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

On Vacation
returns 09/20/2014
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.

Recent Answers

2014-07-31 Planets' Atmospheres:

The primary reason that Mercury and Mars do not have atmospheres is that they are too small to hold onto one. There is a detailed though incomplete discussion of this on my website at http://cseligman

2014-07-30 Temperatures on Mercury:

Hello,      And thanks for your response. Let me touch on several aspects here:    1) You write:    "Had I understood everything well from the beginning, I wouldn't have needed to ask AllExperts, would

2014-07-29 Temperatures on Mercury:

Hello,    First, according to my Websters Encyclopedic Dictionary - so we are clear -  the primary definition of "actual" is:    Existing in act or fact, REAL    Hence, my meaning holds.  (The def. you

2014-07-29 Temperatures on Mercury:

Hello.    Your question actually encapsulates a frequent misconception to do with astronomical measurements, whether of distance (say to a nebula like Orion), or temperatures - say of the stars or surface

2014-07-22 Cameras:

It's true that the main thing that keeps us from seeing stars in the city is simply all the lighting. Back when the Northridge quake occurred (that's probably the one you heard about), the police received

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