ExpertAverage RatingsExpertise

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

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

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

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.

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.

Recent Answers

2015-03-31 When is the sun in zenith in my place?:

The page or site must have just been offline for a while (I've had a lot of trouble with one site or another being offline recently), but was working just fine when I tried it a moment ago. This year the

2015-03-10 star formation:

Hi Colleen,    I'd be happy to help. About the third grade is when I became interested in the stars - and the curiosity has never stopped. Please tell her there are more women and girls in astronomy than

2015-02-24 Mars / earth oppostions and mars 686 day earth year:

By a lucky chance, I just finished writing and posting a page about how the synodic period (which is the same as the average time between oppositions or any other specific aspect, such as Eastern or Western

2015-01-17 Orange dwarf stars etc.:

Hello,    I am not sure you're aware, but the number of "habitable" planets found thus far is exceedingly small. Based on recent papers delivered at the 225th meeting of the American Astronomical Society

2015-01-06 solar ignition:

Hi Joseph,    I think your question can be answered by a Hayashi Track diagram - see Unfortunately, on-line descriptions are not

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