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SSJRyu1/Kid Buu the galaxy buster
User blog
Kid Buu's outrageous power in DBZ
361347721.jpg
So Kid buu's power is a hotly contested thing and has been for a long time, mostly due to differing opinions of what should be taken as literal, and what should be taken as hyperbolic, also due to unknown time frames for statements and feats. But in DBZ he has one feat of being able to destroy the Grand Kais planet in that instant with one attack, which is not ambiguous or hyperbolic at all.
The big issue with this is nobody knew the size of the Grand Kais planet. However I believe I have sufficiently found an accurate estimate for it's size, based on a direct side by side screenshot of the planet, and heaven (which is the size of the Universe), and a second screenshot showing the planets relatively tight orbit of Heaven, along with it being somewhat comparable in size to heaven, and not simply up close to the viewer, due to it being depicted behind the visible curvature of heavens surface, as the plane travels away from the viewer towards it after it came out from the horizon.
So by using some simple pixel scaling with Heaven being the diameter of the Observable Universe to be conservative, I found the approximate size of Grand kais Planet.
https://imgur.com/a/kIPO2mk
Heaven: 245 pixels
Grand Kais Planet: 9 pixels
9/245 = 0.0367
8.798e26m (diameter of Observable Universe/Heaven) x 0.0367 (GK Planet compared to Heaven) = 3.228866e25m or 3,412,914,055 light years.
Now with the size of the Grand Kai's Planet out of the way, we can move on to the speed and power of Kid Buu's attack that can wipe out a planet 3,412,914,055 light years in Diameter!
Energy needed to destroy
As seen here it is stated that Buu would destroy the Grand Kai's Planet.
https://imgur.com/a/wVALigh
Now a simple calculation to find how many joules of energy you would need to accomplish such a feat. We can easily just use the GBE of a Planet of that size with the same gravity as Earth for an approximation, even if it is a low ball. We can use a calculator for this to increase accuracy and give us an upper and lower yield. All we need to do is plug in the diameter in Km of GK planet, which is 3.23e22km.
http://www.stardestroyer.net/Empire/Tech/Beam/Calculator.html
https://imgur.com/a/CrBrcqP
As we can see here, the resulting numbers are
Low end (less accurate): 3.642E+87 joules (Multi-Galaxy level)
High end (More accurate due to faster dispersion): 4.999E+113 joules (Well above Observable Universe level)
SO to summarize kid Buu is actually multi-galaxy to Universe level in the anime, due to being able to destroy Grand kai's planet with a single ki blast.
Fat Buu was stronger than young beerus who can destroy the kaioshin realm . He was also going to destroy the universe over time like broly so both have galaxy busting feats.
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