You have a iron rod with length of 1 lightyear. If you push one end of rod after how much time other end will move? You have a iron rod with length of 1 lightyear. Now, suppose you pushed one end of the rod. About how much time will pass before the other end moves?
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More that 1000 yearsActually, it's a lot longer than a thousand years. Any sudden force at one end will propagate along the iron rod at the speed of sound in the iron rod, which is about 5000 meters per second. A light year is roughly 1000000000000000 meters, so you know where this is going.
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