Avengers Again

  I finally understood it.

How did Thor return?

While not spelt out, Loki rhetorically asks how much Dark Energy the All Father (Odin) used to send Thor to Earth, implying the "other ways" Loki briefly mentioned to Thor the first film depicting both characters, as well as establishing Thor's coming to Earth as a costly move for Odin. Loki also mentions that Thor would need the Tesseract to return, implying that the Tesseract itself is going to be the energy source for both Asgardians to go home. 

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