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 Feb 18 comment Who discovered momentum? @JohnMcVirgo Ok, fair enough. I was just going by what I learned in my Mechanics class but I thought that he did actually use F = ma in Principa Mathematica... guess I was wrong! Feb 5 awarded Editor Feb 5 revised Could a Dyson sphere destroy a star? added 37 characters in body Feb 5 comment Could a Dyson sphere destroy a star? Mm, ok. I see what you're saying. I always end up confusing myself when I think about problems like this! Feb 5 comment Could a Dyson sphere destroy a star? If you think about it, the shell's center of mass is directly in the middle. If that is even slightly misaligned with the CoM of the star, one side of the sphere will be attracted to the star more than the other and it will move towards that direction. As the side gets closer, it is attracted even more, causing it to crash into the star. It is explained on wikipedia better than I can: en.wikipedia.org/wiki/Dyson_sphere#Dyson_shell Feb 5 answered Could a Dyson sphere destroy a star? Feb 5 awarded Supporter Jan 15 comment Who discovered momentum? If anything, this guy contributed to formulate the idea of momentum more than Decartes: en.wikipedia.org/wiki/John_Philoponus But I am not an expert or anything. The mathematical description of momentum, which we use in physics is a Newtonian thing but the philosophical idea has existed for millenia and Decartes contributed to that in some way. I don't really know enough to comment. Jan 15 awarded Teacher Jan 15 answered Could a viable solar system work with a cluster of dwarf stars in center? And would it last longer than a single stellar mass star? Jan 15 comment How long does it take to weigh an uncooperative mass? If the center of mass isn't a problem then the measurement doesn't change in time. Unless your masses are jumping up and down? In which case this is more of a statistics problem than a physics one. You can never get an exact answer from a measurement but what you normally do is choose how much percentage error you are ok with and calculate the time required to get to that by assuming a particular statistical distribution, like say, a normal distribution. Sorry I couldn't be more help. Jan 15 answered How long does it take to weigh an uncooperative mass? Jan 15 answered Should you run when under rain? Jan 15 answered Who discovered momentum?