Since When Has Everything in the Known World Been Discovered?

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The discussion centers on the idea that while many concepts in astronomy and physics, such as celestial mechanics and spherical geometry, have been largely explored, they still hold significant practical value. Participants highlight the importance of teaching classical mechanics as a foundation for understanding more complex theories like general relativity. There is concern that the focus on advanced topics may deter students from pursuing physics, as they might prefer more commercially appealing fields like computer science. The conversation also touches on the ongoing discoveries in the solar system, suggesting that not everything has been fully understood or uncovered. Overall, the dialogue emphasizes the balance between teaching established knowledge and engaging students with the mysteries still present in the universe.
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I know it's something where everything has been discovered, but it's still quite useful.
 
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I think it just comes down to a question of semantics and priorities: they teach classical mechanics, and maybe more specialized astrodynamics---but from there "celestial mechanics" are just specific applications.

Similarly with spherical geometry: its just such a small topic (small wrt common applications) that its not worth its own class... you get the basics from regular geometry, and anything else comes simply from more advanced differential geometry.
 


Simfish said:
I know it's something where everything has been discovered, but it's still quite useful.
Something to do with ethics committees together with 'cruel and unusual punishment' laws?

Departments these days are competing for students, you lure them into Astronomy with stories of black holes and fundamental questions about the creation of the universe. If you then hit them with Smart's spherical trig in astronomy 101 they will all defect to computer science where they can learn about computer games and become 20 year old billionaires.
 


News to me. No physics department I know of has stopped teaching classical [Newtonian] mechanics. It still works 99.9% of the time. If you don't already know Newtonian physics, GR is incomprehensible.
 


Simfish said:
I know it's something where everything has been discovered, but it's still quite useful.

Something where 'everything has been discovered'... Since when? We are still uncovering observational evidence in the SS that can't be explained - yet.

Cheers

David
 
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