Listen Now Download as mp3 from the show The Birth of Sunspots and Black Hole Collisions QuestionFelix Nielsen asked: I actually have more questions that you'd like me to ask, but one of them I tried to figure out on my own, and failed.
Imagine, for a moment, an empty universe, to avoid interference. We then place two grains of sand, or something else if you wish, a great distance apart, say a light year. (a billion trillion quadrillion light years and rather heavy objects would also be fun ;) ) It is my understanding that these two objects, as long as they've got mass, will attract each other so, my question is:
Given similar parameters as previously explained, how long would it take for these two object to collide and how fast would they be travelling at the time of impact?
I would also be very interested in understanding the maths. as previously explained, I've tried, and failed. But I can understand if it isn't practical.
In any case, thank you for your time, I do hope you'll answer my question.
Best regards. Felix Nielsen Copenhagen, Denmark
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CommentsFelix Nielsen asked the Naked Scientists: I actually have more questions that you'd like me to ask, but one of them I tried to figure out on my own, and failed. Imagine, for a moment, an empty universe, to avoid interference. We then place two grains of sand, or something else if you wish, a great distance apart, say a light year. (a billion trillion quadrillion light years and rather heavy objects would also be fun ;) ) It is my understanding that these two objects, as long as they've got mass, will attract each other so, my question is: Given similar parameters as previously explained, how long would it take for these two object to collide and how fast would they be travelling at the time of impact? I would also be very interested in understanding the maths. as previously explained, I've tried, and failed. But I can understand if it isn't practical. In any case, thank you for your time, I do hope you'll answer my question. Best regards. Felix Nielsen Copenhagen, Denmark What do you think? Felix Nielsen , Wed, 20th Apr 2011 Maybe this one can be of assistance? Assuming infinite time and finite starting distance: Further to Phrac  and assuming they are not at a large distance and travelling away from each other rapidly at which point i would say that they will decay to energy and heat bfore they meet / orbit. Hi Guys, Mike, this subforum is mainly for answering the questions from a 'main stream' view point. I say mainly because sometime it splits into, more or less, widening definitions :) so it can be hard to see the difference at times. 
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