Since our galaxy is about 100,000 light-years side to side and we are about 30,000 light-years from the centre of our galaxy then by dividing 100,000 by 2 making it 50,000 and then minus 30,000 then it estimates we should be 20,000 light-years from the nearest edge of our galaxy.
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They believed it was like a giant plane, and that if you went too far toward the horizon you would fall off the edge of the earth.
As far as we know, we only use scientific notation here on Earth, for the computing of very large numbers (like the distance between planets) or very small numbers (like the radius of a hydrogen atom).
From earth to the moon.
5 Million One Pound coins placed edge to edge would stretch for 112.5 kilometres. Travelling via the M1, that would put you somewhere in the vicinity of Nottingham.
As far as I can see I would say exactly zero.