ईथर (परिकल्पित माध्यम)
sanpoorn brahmaand mean tatha samast padartho ke aantarang mean vyapt ek parikalpit madhyam jisamean vidyutachuanbakiy tarangoan ke sanchar ki sanbhavana prakat ki gee hai, yadyapi eethar ke astitv ki pushti kisi prayog dvara nahian ki ja saki hai. kee varshoan tak vaijnanik eethar ke gunoan ko samajhane ki cheshta karate rahe, lekin isamean unhean saphalata nahian mili aur pata chala ki eethar ka vastavikata se koee sanbandh nahian hai. aiansatain ke apekshikata siddhaant ke anusar eethar ki sankalpana vyarth hai. at: isake astitv ko ab adhikaansh vaijnanik nahian manate haian.[1][2]
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