You are, of course, wrong since I place the piano and cat far closer to each other (observed to be by superman on the Moon) in space and time than you do. NOT two seconds away from crash and crush. NOT one second away from crash and crush, but a space of a split second's distance. So close to happening that it has already happened when superman observes that it is about to happen "at a distance" (at the distance).Terminology:
What you are talking about is observable universes. In a universe of infinite extent (of which, by definition, there is only one), there will be and infinite number of observable universes.
Combinations and Permutations:
You are missing the point of an infinity of universes.
For every universe out there that is identical to ours, there are uncountably more that are almost exactly the same but not quite - one atom out of place, etc. There's even more universe out there where 100 atoms are out of place. etc.
There are an uncountable number of observable universes where I flew off in my starship ten seconds later and arrived in the next universe ten seconds later.
There are an uncountable number of observable universes where I flew off in my starship ten minutes later and arrived in the next universe ten minutes later. etc.
There are an uncountable number of observable universes where I flew off in my starship ten years later and arrived in the next universe ten years later. etc.
It misses the point to concentrate on only the ones that happen to coincide.
Muons experience time dilation during a trip from the top of the atmosphere and the bottom of the atmosphere. Does that count as "space travel"?
There is also no "sitting stationary not going anywhere" without time travel either. Because we are always travelling through time. So it;s kind of a truism.
This is not necessarily true. The light from the falling piano takes a little more than one second to reach him. If it takes the piano 2 seconds to fall then he will arrive in plenty of time to save the cat.
This is word salad. You are making a mountain out of a molehill.
Superman sees the piano falling after a 1.25 second delay. If he flies home at "infinite speed" (which he can't, but whatever) he will arrive as soon as the piano started falling. It takes a finite length of time to fall. If that time is longer than 1.25 seconds, he will arrive in time to save the cat.
Otherwise, I gave you a 'like' because we are pretty close, reasonably close, in evaluation of the scenario. And, yes, from the top of the atmosphere to the bottom does count as space travel with concomitant time travel. All of us Earthly space travelers, in flights between top and bottom, nearly so, have experienced the verticality of the gravities and atmospheres. In my case, in my nearly 78 years, many, many, times. Which is why I, like Newton's apple, observing gravity to be an opening up of the universe, an accelerating expansion of the universe, ahead, not a closing down . . . not an accelerating contraction to a point of universe.
Your responses to my supposed "word salad," are also so much "word salad." I spent many decades racking up great performance reports for mine (one point, if you'll pardon the pun, included in the whole).
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