ExpertAverage RatingsExpertise

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.

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.,.

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.

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.

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

2015-01-17 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

2015-01-01 Scope:

Hi James,    We know the distances of nearby stars quite accurately, and the distances of more distant stars in our galaxy fairly accurately. Astronomers have several tools to help them, including those

2014-12-22 Astronomy:

Hi Irshadullah,    Interesting question. The short answer is - none that I can find!    The pre-print "The Asymmetry of Galaxies' Physical Morphology for Nearby and High  Redshift Galaxies" by Conselice

2014-12-01 quantum physics:

Hi Richard,    Yes, physics must predict experimental results. That's exactly why I have problems with many cosmological theories or even string theory (see Peter Woit's excellent book - "Not Even Wrong")

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