Recent content by SeaDour

Thanks for the quick re-direct, Doc Al. I had been feeling so proud of myself for thinking up the idea all on my own, but am now humbled to see that the exact same idea was brought up a few short weeks earlier. country boy -- my thinking was that if it didn't have a small mass, it would have a...

Say you (somehow) constructed a very long, sturdy rod, about a light year in length. Say it was made of unobtanium, so it has the same mass as a relatively short steel rod. Now say there are two astronauts, one at each end, and one of the astronauts gives the rod a firm push in the direction...