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At the end of Avenger's Assembled, Thor takes Loki back to Asgard.

He uses some device we don't see before that, which works with the tesseract. Does this mean that the Asgardians have their own Tesseracts? How does it let them return when there is no Bifrost?

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According to the marvel-movies wikia

The Tesseract has the capability to open rifts through space and time. Which is how the Red Skull met his end and how Loki transported himself and later, the Chitauri, to Earth through a portal.

The device is merely a container, or something to focus the space-time manipulation ability of the Tesseracts. Is exact mechanism is a mystery, and like Thor's hammer, it's some kind of technology that just look like magic to us.

  • I'm cool with magic-tech from the asgardians, but how did he get it...it's not as though he has a utility belt! – AncientSwordRage Jun 1 '12 at 14:21
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    @Pureferret Maybe Thor salvaged some part from the device Selvig built and MacGyver something with 2 or 3 hammer hit? – DavRob60 Jun 1 '12 at 14:48
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I suspect it was a collaborative effort on the part of SHIELD, the Avengers brain bank of Tony Stark and Dr. Banner, with the initial development on the part of Dr. Erik Selvig.

Let's think of this the other way. Who else COULD manufacture the technology that would allow them to harness the Tesseract/Cosmic Cube's energy while using the information gathered about the Asgardians which would then pinpoint their way back to Asgard? And do it in a timely fashion?

The Cube can create dimensional rifts (and a variety of other phenomena) so all it needs is a targeting system to control where something or someone is moved and tapping the right energy so the device doesn't use too much power and reveal its location. I believe that is the reason the device is shaped like a cage, to limit its visibility once it's off Earth. The Avengers could have made it with a little help from Dr. Erik Selvig and SHIELD:

  • Iron Man: Provided the miniaturized containment unit to tap the power of the Tesseract. He made it far smaller than Dr. Selvig did (probably half the time too) and made it Thor-portable as well.
  • Thor: Provided a dimensional anchor using Mjolnir and information about the location of Asgard. Remember, it's just a place on the other side of a wormhole.
  • Bruce Banner: Provided the information necessary to find the particular energy needed to utilize the device in the first place; energy management and propagation is his thing.
  • Dr. Erik Selvig: Built the first dimensional gateway using the device, so he would be credited with providing an understanding of the inner workings of his tech, translated by Tony Stark and Dr. Banner.
  • SHIELD likely provided the parts and security while they worked to send Loki home.

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