ExpertAverage RatingsExpertise

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.

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.

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

On Vacation
returns 11/01/2015
Questions on observational astronomy, optics, and astrophysics. Specializing in the evolution of stars, variable stars, supernovae, neuton stars/pulsars, black holes, quasars, and cosmology.

Recent Answers

2015-09-09 flashing object in the Maine sky:

Hello Dan, and thanks for using AllExperts...  The answer to what these "flashing" stars are lies no farther away than Earth's atmosphere. In that atmosphere, particularly those regions closest to Earth's

2015-08-28 Life on Mars planet.:

Hi Prashant    I think it is the dream of many astronomers (and many other people!) that we could eventually find a way to send humans to Mars.  Remember that right now Mars is less "hospitable" than Earth

2015-08-23 Jason Discoverer 454 Model 313:

HI Mary     Jason scopes are legendary for causing problems for people.  Here is a link to a series of pages that might help you:    The difference in model

2015-08-21 rotation of the Sun:

Points addressed:    1) There is no such force as "centrifugal force". The correct force is centripetal - a center directed force that is equated to the force of gravitational  attraction (F = GMm/r^2)

2015-08-20 How to compute planetary conjunctions, in particular planet-to-star?:

The easiest way is to use planetarium software. My favorite is Stellarium, which is a free download from    You'll need to try the various menus to see how to best handle things

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