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For the galaxy thing- should we the sum of all GBE of the stars and planets in a galaxy or should we just use the amount of energy needed to simply scatter stars in a galaxy. The second option would likely yield a lower result. The binding energy of milky way's structure for example is roughly 10^54 J. Which is 4-B.
However, we go by the first method, then the rough estimate of the GBE of stars and planets in the galaxy would still likely be in the high end of the 4-B range to lower part of the 4-A range.
However, we go by the first method, then the rough estimate of the GBE of stars and planets in the galaxy would still likely be in the high end of the 4-B range to lower part of the 4-A range.