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Message: <blockquote data-quote="bolen" data-source="post: 2270736" data-attributes="member: 1442">No sorry a black hole is only formed if the REST mass of the object is greater then a value (which is 2 GM/c^2 for a non rotating non charged BH)You are correct, measured by an observer in a different frame, your mass would increase and if you could accelerate up to c the observer on the ground would say it is approaching infinity. (lets stick to constant velocity from now on, it's easier)  But if you measure your mass in a ship going at .999 c you say your mass is the same.  However to the guy on the ground says your mass is nowM/Sqrt[1 -(.999)^2]= 22.4 MSo he says your mass is 22.4 times your original mass.I say you increase energy not mass,  I (and most relativists) resevere the term mass for REST MASS.  Hope that helps</blockquote>