When do you need the 的 at the end of sentences? E.g. 你是从哪里听到这个消息的？ I learned the following sentence.


  你是从哪里听到这个消息的？


Is it possible to omit 的 here?  So is 你是从哪里听到这个消息？ wrong?

I know that the particle is used to signal ownership, but is it necessary to use it here? 

Information seems to be a noun already?
They are almost the same meanings:
你从哪里听到这个消息？
你从哪里听到的这个消息？
你从哪里听到这个消息的？
你是从哪里听到的这个消息？
你是从哪里听到这个消息的？