Is ので the same as のだ?


I find it suspicious they look similar and both function to give explanations.
Is it just coincidence or is ので kind of like the て form/mid-sentence form of
のだ?




ので has similar meaning to から in that they can both mean "because, given
that..."  

のだ, or のです are versions of んだ/んです that are more often used in writing and they
don't really mean "because", they just imply the speaker or writer is
explaining or emphasizing things. It's quite hard to explain, you can read up
on it here:  
<https://jlptsensei.com/learn-japanese-
grammar/%E3%82%93%E3%81%A7%E3%81%99-ndesu-%E3%82%93%E3%81%A0-nda-meaning/>  
or here  
<http://maggiesensei.com/2010/09/08/request-lesson-when-and-how-to-
use-%E3%82%93n-%E3%81%AE%E3%81%A7%E3%81%99%E2%86%92%E3%82%93%E3%81%A7%E3%81%99%EF%BC%89/>  

