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.

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.

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.

Philip Stahl

On Vacation
returns 05/12/2016
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.

Recent Answers

2016-04-13 Black Holes and Neutron Stars:

(Sorry for the delay in answering this. Yesterday was my wife's birthday and we were out and/or busy all day, so I didn't receive your question until well after midnight, and was too tired to give it a

2016-04-10 Black Holes and Neutron Stars:

For stellar-mass black holes, there aren't many differences. The normal way of observing a neutron star or stellar-mass black hole is when an aging binary companion dumps large amounts of mass onto/into

2016-03-26 Earth centric?:

A star is distinguished from a planet by being hot enough to radiate a substantial amount of heat and light (planets can radiate substantial amounts of heat but are not hot enough to radiate substantial

2016-03-25 Earth centric?:

No, it is not. The mass required for an object to become even a very small star is much larger than the mass of any planet. If a planet had more mass than such a star, it would become a star itself, so

2016-03-14 planets rotation:

Your answer was more nearly correct. The teacher's answer was almost completely wrong. The correct answer would be that the rotation rate depends on the speed of rotation and the size of the planet, but

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