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

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.

James Gort

On Vacation
returns 05/02/2017
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

2017-03-27 Fair Market Value:

Hi James    It was Sir Isaac Newton who first came up with this idea.  Instead of using a lens, he used a concave mirror that collected light and brought it to a focus---like a shaving mirror.  Just about

2017-03-26 Fair Market Value:

Hi James    Most amateur telescope makers choose to make reflecting telescopes, using mirrors rather than lenses.  The process is the same:  you grind the glass to shape using varying sizes of grit, then

2017-03-26 Fair Market Value:

Hi James    This is not an easy question to answer. You are correct, that there are few moving parts and little wear and tear on most telescopes--so you'd think they would have a high resale value.  But

2017-03-07 Cheap Telescope:

Hello,      First, before giving a direct answer let's look at some applicable quantities. These include the space station's longest dimension (109 m) and its mean distance (249 miles). We want to ascertain

2017-02-24 Probability:

Exactly! There is simply no specific way to obtain such a result given you are no longer in a deterministic realm, but a stochastic or nonlinear domain.  I don't know if you've ever taken a college physics

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