潘朵拉並不是一個行星，它其實是一個巨型氣體行星的衛星，體積與土星相當。這個巨行星叫做Polyphemis，它位於半人馬座的Alpha星系，這個星系距離我們4.4光年，是離我們最近的恒星系統。
為啥那些山(Hallelujah Mountains)能漂浮？
潘朵拉有一種稀有的礦藏Unobtainium，由於磁場漩渦效應，一些外露在地表的巨型Unobtainium岩石漂浮到了空中，形成了壯觀的空中山峰，人類把它們叫做「哈利路亞山」(Hallelujah Mountains)，因為這些礦石可以讓他們致富；而納美人則把它們叫做「雷巖」(Thundering Rocks)，並心懷畏懼。

The Hallelujah Mountains (Na’vi named them "Thundering Rocks") are floating islands that circulate slowly in the magnetic currents like icebergs at sea, scraping against each other and the towering mesa-like mountains of the region. On Pandora, huge outcroppings of Unobtainium rip loose from the surface and float in the magnetic vortices due to the Meissner Effect.

The entire area is sacred to the Pandorans. This poses a problem for the humans who have come to mine them for their mineral wealth. The mountains float like clouds among the fixed mountains and swirling cloud structures. When they are in clear sunlight they cast distinct shadows on the land below.

They are overgrown with foliage at the top, and straggly beards of vines hangs down beneath them like the roots of air-ferns. Their sides are sheer cliffs. Waterfalls, originating on the mesa-like tops, stream down the sides and disperse into spray at the bottoms, like upside-down geysers. The local peaks and mesas actually project above the level of the craggy undersides of the few floating mountains Jake Sully can see, so it’s obvious that collisions are inevitable. It is also the place Norm Spellman wants to visit most on Pandora.

The Hallelujah Mountains are also where Mountain Banshees choose to roost. This location makes the final challenge on the path to becoming a Na’vi hunter even more difficult and dangerous as the route taken to the top of the mountains are treacherous. One wrong move will send a candidate plummeting to their death.