Astronomy/Expert Profile

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.

Experience in the area

I was a professional astronomer (University of Texas, McDonald Observatory), lecturer at the Adler Planetarium, professor of astrophysics, and amateur astronomer for 42 years. I have made numerous telescopes, and I am currently building one of the largest private observatories in Canada.


StarDate, University of Texas, numerous Journal Publications

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Recent Answers from James Gort

2017-01-21 cosmology:

Hi Richard,    I'll try and answer your fairly long question as simply and succinctly as I can. And it will be to the best of my knowledge and understanding. That said, in most areas of science, but especially

2017-01-10 Cosmology:

Hello Tom,    You are correct. Observations "seem" to support that galaxies are receding - from us as well as from each other. They could simply be flying off into space from an initial explosion, where

2016-05-24 Stars:

Hi Corissa,    The answer is gravity. The same thing that keeps the earth together also keeps the stars together. But stars are gas, aren't they? Yes, but even the gas molecules are attracted to other

2016-05-19 universe expansion:

Hi Richard,    I'm not sure if that's actually been proposed in any peer-reviewed publication, but I don't see why that can't be viewed as one possible "explanation". Of course, we'd have to come up with

2016-05-14 Follow Up Question:

Hi Maria,    Humans have imagined all sorts of constellations before, but all were made up of the same stars we see today. In 1922, we adopted an "official" list of 88 constellations.    Please see https://en


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