Quote:
Originally Posted by caleb
Hmmm, I thought as you neared c you gained mass, and at c, you would fall in on yourself, I'm guessing forming a black hole?? Anyone... 
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To collapse into a black hole your mass has to exceed the Chandrasekhar limit - considered to be about 1.4 times the mass of the sun.
Assume a rest mass of 100kg, Trying to determine the necessary speed you would need to achieve 2.7846e30kg,
v/c=sqrt(1-(100/2.7846e30)^2)
rounding errors hide any difference from c.
You would have had to expend 2.7846e33*3e10*3e10 g*cm2 = 2.50614e54 ergs (I think that's the right number of zeroes).
Where did you get all that energy? Your rest mass of 100kg means you were not carrying it in any form when you started.