ExpertAverage RatingsExpertise

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.

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.,.

Recent Answers

2015-11-27 Geocentric:

Hi Al     None of these models is correct.  The Universe really has to no center, and the Earth orbits around an insignificant star that lies from the center of its own galaxy...but you may be thinking

2015-11-08 importance of Keplers second law:

Kepler's 2nd law is extremely important in the discipline of celestial mechanics which is concerned with computing the future positions of planets, for example. Given this, it is also critically important

2015-11-08 the moon laying on its back:

Hi Cromar    The moon looks like it is lying on its back when it sets about an hour or two after sunset.  That's when the light of the sun illuminates only the crescent moon.  That only happens about two

2015-10-27 astophysics:

HI Joseff    Good question.  The terms are often used interchangeably.  Originally, Astronomy was the study of the motions and laws of the stars and planets, while astrophysics focused on the internal

2015-10-20 Objects that have impacted the earth...:

Hello,    The ability to track objects that are potential impactors is extremely limited and I know of no cases where we've successfully managed to do that, say from their point of origin (e.g. asteroid

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