The foundry that made that manhole cover has some great potential advertising claims.
this post was submitted on 02 Dec 2024
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Ok, tin foil hats for this one, our universe isn't exactly infinite in the way people traditionally think like numbers. The edges of the universe bend and form a large shape, say a sphere for simplicity. That cover speeds through and circles back eventually, but do to it's speed and travelling along the edges of everything and relativity, when it returns it's not at the same point or even at the same speed. It arrives before it initially left, quite a bit before it left... So much so that it kills off the dinosaurs.
Sadly, the escape velocity of our galaxy is an order of magnitude higher than the manhole cover's velocity. And even at that speed it wouldn't hit with nearly enough energy to cause a mass extinction. Still a fun idea though. :)
Humanity: did I do that? Hehehe
One thing that no one ever talks about with this is the massive air resistance on it going Mach 164 through the atmosphere would incur (albeit for a very brief period)...I bet that would knock 25-50 kmph off it easily.
What are the chances it was blasted into the sun?
If the event was near the equatorial near midday then there's a very very (very) slim chance it was pointed directly at the sun.
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In Stargate SG1 they do that to destroy and invading alien ship approaching Earth.
So has it been replaced ?