Quotes from the movie "Thor", released in 2011:
Jane: You're the one who's always pushing me to chase down every possibility, every alternative.
Dr.Selvig: I'm talking about science, not magic!
Jane: Well, "Magic's just science that we don't understand yet", Arthur C. Clarke.
Dr.Selvig: Who wrote SCIENCE FICTION!
Jane: A precursor to SCIENCE FACT!
Dr.Selvig: In some cases, yes.
Jane: Well, if there is an Einstein-Rosen Bridge, then there's something on the other side, and advanced beings could have crossed it
Dr.Selvig (disappointed): Oh, Jane
Darcy the sociology student: A primitive culture like the vikings might have worshiped them as deities
Jane: YES, yes, exactly! Thank you!

And later:
Thor: What you seek, it's a bridge
Jane: Like…like an Einstein-Rosen Bridge?
Thor: More like a Rainbow Bridge
Jane: …..god, I hope you're not crazy

Nature: An interdimensional pathway constructed out of magically solidified light
First Encountered: 4.7: "All the King's Mages and All the King's Men"

Description: Appearance-wise the bridge underfoot was indistinguishable from a normal, mundane rainbow seen in the sky, with the possible exception of seeming brighter and more vivid given how closely it could now be observed. Its surface somehow provided more than enough friction to prevent those walking upon it from slipping and falling even in the worst of weather. When used to travel the bridge was more or less encased in dark, churning storm-clouds, possibly serving as concealment, protection or both. The occasional openings in the cloud cover revealed not only that the ground was far beneath, but also that the journey passed over various regions of Scandinavia much further away than the distance they'd walked should have carried them.

Info: Bifrost was spoken of in ancient legends as the method the norse gods of old used to travel between their home world and the land of humans. The entrance encountered by the PC's at Torshaug allowed them to access Þrúðvangr, the domain of Thor, once unlocked properly with the information gained from the Trondheim Texts.

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