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In the ending of Sonic Colors, there is a black hole feat that potentially could be evaluated using mass-energy equivalence, but I'll leave further discussion of that for the comments and evidences for if this qualifies for a realistic black hole. I'm just gonna do the math to scale the size of these suckers and their mass-energy equivalence here.

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"Low-end" size of black hole:

Using this video shot: https://youtu.be/glmRiJx46RY?t=9570

Sonic height = 1 meter = 61 pixels

Width of part = 652 pixels

Width of part = 652/61 = 10.6885245902 meters

Using this video shot: https://youtu.be/glmRiJx46RY?t=9551

Width of part = 68 pixels

Width of beam = 364 pixels

Full width of beam = (364/68) * (652/61) = 57.2150433944 meters

Uses this video for this shot: https://youtu.be/adMheegujxc?t=1916

Beam thing width = 52.5 pixels

Black hole width/diameter = 261 pixels

Black hole width/diameter = (261/52.5)*((364/68) * (652/61)) = 284.440501446 meters

Black hole radius = ((261/52.5)*((364/68) * (652/61))) / 2 = 142.220250723 meters

Black hole mass = ((299792458^2) * 142.220250723) / (2 * 6.67408E-11) = 9.5759406E28 kg

Mass-energy of this black hole = (299792458^2) * 9.5759406E28 = 8.6064262E45 joules

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"High-end" size of black hole:

Sonic’s racing away from the black hole so, the radius of the black hole to its center is gonna be at lowest the distance to the camera since it grew bigger and caught up to where Sonic used to be located.

Screen height: 360 pixels Black hole height: 297 pixels

2atan(tan(70deg/2)*[297/360]) = 1.04767891 radians or 60.02757982802 degrees

Black hole width beforehand is 284.440501446 meters wide, at absolute worst this is the length we are looking at, using the above numbers.

Solve for distance: put in 284.440501446 and 60.02757982802

The angsize calculator gives us the distance to the camera from the black holes center to be “at least” 246.2 meters.

That will be the radius of this black hole during the end of that scene.

Black hole mass = ((299792458^2) * 246.2) / (2 * 6.67408E-11) = 1.6577081E29 kg

Mass-energy of this black hole = (299792458^2) * 1.6577081E29 = 1.4898737E46 joules

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That's all folks!

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