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The _Blame_ [Wikia](http://blame.wikia.com/wiki/Gravitational_beam_emitter),
explained GBE (Gravitational Beam Emitter) as:

> The Gravitational Beam Emitter is a powerful gun used by Killy, other
> special Safeguards, and Silicon Creatures. It has immense destructive
> capacity, able to blow through multiple walls with a single blow, causing
> perfectly round holes within them, followed by explosions. The weapon emits
> so much force, that with a single shot it would stagger it's users backwards
> due to the incredible gravity of the weapon. It can blow everything it
> touches into bits.

![GBE picture](https://i.stack.imgur.com/dqldOm.jpg)

Is there any scientific explanation about this weapons? Like, how can we use
the weapon, etc.


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blame
How does Killy's weapon in Blame! universe work?


This kind of weapon also appeared in _Knights of Sidonia_ by the same author.
KoS's Wikia page has slightly more information regarding Gravitational Beam
Emitter a.k.a. [Graviton Radiation Emitter](http://sidonia-no-
kishi.wikia.com/wiki/Graviton_Radiation_Emitter):

> The Graviton Radiation Emitter (sometimes called the Gravitational Beam
> Emitter) is a futuristic technology conceived by Ochiai, and first used by
> the chimera Kanata.

> The first Graviton Radiation Emitter was grown into the chimera Kanata,
> installed as his right eye. Grown using Gauna placenta, it is strongly
> hinted that the structure of the emitter was grown from the second Placental
> Hoshijiro, and then installed into Kanata.

> After the Mizuki's shakedown cruise, construction of the second and third
> Graviton Radiation Emitters was completed. Made entirely from mechanical
> parts, they no longer relied on placenta for their construction.

But the two series are, to my knowledge, not related; Tsutomu Nihei probably
just recycled the same conceptual weapon.

Since this weapon is so blue-sky theoretical, there's no way there's gonna be
a scientific explanation about its workings for the coming centuries or even
millennia. There is a related
[discussion](https://physics.stackexchange.com/questions/170215/in-theory-
could-gravitational-waves-be-used-to-make-a-gravity-laser) on Physics.SE which
you can peruse at your leisure.


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I can't find a link right now, but Tsutomu Nihei gave a sort of explanation
once that went something like this; The City is incomprehensibly vast, most
likely expanding toward the edges of the Solar System. So it's a truly massive
object and, as such, should exert a tremendous amount of gravity; far more
than what would normally collapse any star into a black hole. In order to
retain its structure and not collapse in on itself, there must be technology
within it that manipulates space and gravity to offset the implossive force
and maintain about 1G throughout every stratum/layer of the sphere.

Here's where the GBE comes in. Nihei suggested that the GBE fires a beam of
gravitons in such a way that this retention force is disrupted, thus allowing
gravity to behave normally along the path of the beam, which is sufficient to
collapse that space/material in upon itself. Combine this intense localized
gravitational force with the energy released from matter being almost
instantaneously compressed into ~0 volume, and the result is the spectacular
destruction we see when Killy fires it.


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