and yes, also mathematics (useful for quantitative analysis)

I doubt that I have enlightened you on what geography has to say on stellar evolution, mainly because it (probably) hasn't got much to say.  That is your field of study.  Instead, I hope that you will think about what the point of research on stellar evolution is and how it will improve lives of all species on our planet.  I may be ignorant, so enlighten this poor soul please.

Geography is somehwere between arts and science depeding on whether one studies the human or the physical environment. True, historical geography has a lot in common with history, but I doubt that thats the case with lets say soil geography. I don't think that historians spend hours in the lab analysing soils for 
nutrients, heavy metals etc.... Yes, geography like ecology etc. are not sciences like physics etc. as its impossible to study environmental componets isolated in a vacuum. And OK I accept that curiosity is the mother of all sciences and not geography, as long as its not mathematics! 

Your second point regarding food abundance is true. There is enough food 
to feed everyone its just that food is not distributed evenly. Even during the great famine in Ethiopia, the country was a net exporter of food. Food is sold to the highest bidder not to the person that needs it the most. There is enough renewable energy to go around eg. solar, wind etc. its just that we are not tapping those resources as yet to a large extent. Using oil and coal for energy is not a sustainable practice since you can only dig it out once, and of course you create pollution.... 

I'm not sure though what you mean when you say that countries with abundant resources are too selfish to share it with their less endowed neighbours. Countries with abundant resources (as many Third World countries are) do share their resources very much unselfishly (because they have to due to debt etc...). It is ironic to see that some of the world's wealthiest nations (such as Singapore, Japan, the Netherlands) are the least endowed with resources.  

Studying stellar evolution is not useless! All basic research seems useless. Studying the biology of a speice of a microorganism may seem useless to some now only to find that it has some useful medical properties a few years down the track. Just simply knowing, out of curiosity, as much about life, the earth, the galaxy, is what science is all about. I never said that research on stellar evolution was useless but simply that its not the most important. As you said, Sirius might explode in a few million years, therefore we have plenty of time to deal with that problem! By that time the earth might have gone through global warming, nuclear winter, several ice ages, been invaded by alliens etc 
etc. and the species of Homo sapiens may be either non existent or have 
evolved to be Homo ?. Of course, lets worry about future generations. Too many politicians only seem to think a few years ahead totally ignoring the next and the next and the next generation. However, I doubt that even the most radical environmentalists think a few million years ahead. And anyway, I'm sure that humans will be capable of interstellar travel in a far shorter space of time than a million years; in search of other life forms and resources rather than trying to run away from an exploding star.

Geography binds the different spheres of the universe together - the lithosphere, biosphere, atmosphere, hydrosphere - and this encompasses all 
activities taking place in this world. This is not to say stellar evolution isn't part of Geography as we know it. The subject matter of Geography is constantly changing. In the Middle Ages Ptolemy's cartographic achievements were considered all there is to "Geography". But look at it now. The subject matter ranges from asking why the drought in Asia is more pronounced that ever 
before, to charting people's mental maps of certain places that evoke certain 
imaginations. And the recent renewed interest in Mars and the question of the 
existence of water on another planet, together with stellar evolution, will surely become a post-modern focus in the study of geography, broadening its eaches from the mere confines of Earth to beyond it. 

The fact that Geography is the amalgamation of all the various aspects of life 
on Earth points to the necessity in having a knowledge of it. People brush 
geographers off as "jacks of all trades, but masters of none", and I question: 
what is the use of knowing a subject so intimately only to ignore or be 
ignorant of others? I believe wholeheartedly in specialisation. I believe that 
only those who have a high degree of expertise in certain fields would be able 
to invent and ensure the continued discovery of newer ways. And I respect 
these scientists - those who have spent vast amounts of time and effort and 
ingenuity to make life better for everyone else. I only ask that there be respect for others - others who are able to see things as a whole, not be swallowed by the exciting opportunities in, say, astronomical explorations, to ignoring the need to give life to those on Earth who are living on the edge of human survival. 

I call for a balance, though realistically it has been difficult. Because Nature is based on equilibrium that sustains the delicate nuances of being, and it would be detrimental to uphold certain duties to the detriment of others. Think why many predict that future wars would be fought over water. Think of all of us who disregard the need for balance within world water reserves, and constantly draw water from grounwater resources without awaiting its renewal, pollute the seas, realise too late, then disturb the balance even further by cloud-seeding. True, cloud-seeding is deemed necessary for the survival, of say, drought-hit residents of Malaysia. But this has happened only because we realised too late. 

Call Geography what you will - but never underestimate its importance. 
 

(Ed: I am only trying to stay true to the discussion that followed, so if this seems to you a message belonging to another realm, do excuse this inclusion.)