It is a 3D universe made based on pictures taken by Hubble, and a super-close shot of the space shuttle launch.
The 3D universe part is so bad, it's indescribable, it's tear-jerking, and Avatar is scum.
Especially at the end, passing through hundreds of billions of galaxies, seeing the blurry light emitted tens of billions of light-years away tens of billions of years ago, and then the camera rewinds, through tens of billions of years, back to the lonely blue sphere.
What does it mean to read the sky and the earth alone, but cry?
That's it.
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