# Some thoughts I've been thinking about.

Predisposition's aside, I've been thinking about a whole bunch of stuff. I'm not even sure if they're questions.

1) If we assume when a spaceship is moving at the speed of light, it has infinite mass. In order for a ship with infinite mass to move, it would require infinite energy. Since the fuel is moving at the same speed, it would also have infinite mass as well. If the fuel with infinite mass is turned into energy, would it not then give us our required infinite energy?

2) Assuming we did have spaceships which could move at the speed of light, unlike many TV shows/programs, it would not be my great great great grand children to get to the destination, it would be me, even on a trip of several thousand light years. This is because Time onboard the ship would be frozen. I would start the trip, and finish the trip, in less than a blink of an eye.

Of course, everyone I ever knew has now died of old age. I can not help but think of how a society would function in a state of "Never see the same person twice". You could take a trip to work, and by the time you get there, your place of business could of gone bankrupt 100 years ago. And by the time you get back, you might not even have a house!

3) It has been talked about before but I never really found an answer; Escape Velocity is a one shove and free ride deal, correct? You can not get away from a black hole because EV is greater than the speed of light. But what if, instead of using just one shove, you use a constant supply of force untill you was safely away? Would that work?

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chroot
Staff Emeritus
Gold Member
1) It's not physically possible for something massive to go the speed of light, or to have infinite mass. Since the premise is unphysical, there really is no answer. It's not a valid question.

2) This is correct.

3) The escape velocity is greater than c inside a black hole's event horizon. It is less than c outside the event horizon, and c exactly at the event horizon.

There is no way for any object inside the event horizon to ever escape. However, if you are outside the event horizon, and equipped with a suitably powerful thruster, you can certainly escape.

- Warren

LURCH