ether" and "aether"

[OrangeScorpion]

What is the difference between "ether" and "aether"? When translating into Spanish the two words give me the same translation: “éter”. But I have the impression that they have different meanings, but I cannot find the difference on the Internet.

 

[Approaching Infinity]

What is the difference between "ether" and "aether"? When translating into Spanish the two words give me the same translation: “éter”. But I have the impression that they have different meanings, but I cannot find the difference on the Internet.

They're the same, when referring to definition 3 below.

ether |ˈiːθə|
noun
1 Chemistry a pleasant-smelling, colorless, volatile liquid that is highly flammable. It is used as an anesthetic and as a solvent or intermediate in industrial processes. • Alternative names: diethyl ether, ethoxyethane; chem. formula: C 2 H 5 OC 2 H 5.
• any organic compound with a similar structure to this, having an oxygen atom linking two alkyl or other organic groups : methyl t-butyl ether.
2 (also aether) chiefly poetic/literary the clear sky; the upper regions of air beyond the clouds : nasty gases and smoke disperse into the ether.
3 (also aether) archaic Physics a very rarefied and highly elastic substance formerly believed to permeate all space, including the interstices between the particles of matter, and to be the medium whose vibrations constituted light and other electromagnetic radiation.
• ( the ether) informal air regarded as a medium for radio : choral evensong still wafts across the ether.