Hi folks, I'm brand new here... never been a part of a physics forum before and I'm just an amateur I have no professional or academic background hah most is a grade 10 "science" course (a unit on bio, unit on chem, unit on physics not even specified and barely touched physics). Anyways that's my introduction Out of nowhere today a light bulb went off and I was curious about something. If you were to go for example at 0.99999999c in a spacecraft I understand that your mass would increase largely relativistically. Now I am wondering, would it be possible to reach a sufficiently high percentage of the speed of light to reach critical mass with a finite mass and thus gravitationally collapse and form a black hole? Or would that require light speed (infinite mass) which is obviously impossible. Also, if it were possible (hypothetically - I know having the energy required to reach this potential speed would most likely be completely implausible) what would happen, I mean if to the Earth's perspective you collapsed into a black hole how would that work if you were a black hole from some perspectives and not others? Thanks if anyone can help me, I am ASSUMING it would not be hypothetically possible but the thought still struck me as worth asking.