ExpertAverage RatingsExpertise

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.

Robert L. Straitt

Questions on general and theoretical physics, cosmology, general astronomy, solar and/or stellar astronomy, relativity, unified field theory, and history of science.

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

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.,.

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.

Paul Wagner

On Vacation
returns 08/15/2015
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

2015-07-26 is this meme factual:

As noted in my answer to your first question, we can see the Andromeda Galaxy and the Magellanic Clouds, which are satellites of our galaxy, with the "naked eye" in a dark sky. With an "average" telescope

2015-07-26 What galaxy is this?:

The image you attached is an artist's conception of what our Milky Way Galaxy might look like if seen from "above" or "below" the disk of the galaxy.    All the individual stars we can see in the night

2015-07-13 infinity & the universe:

Hello,    THe Big Bang, according to existing theory, originated from a point roughly the size of an atomic diameter, or about 10^-15 m across. Hence, originating from a super dense state and likely triggered

2015-07-12 infinity & the universe:

Hello,    In current standards of astronomical parlance when one uses the term "universe" it refers to a single entity which may be infinite or not. Here, I refer to extent not duration. So far as our

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

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