# B Is it true that a rocket at light speed has infinite mass?

1. Dec 14, 2016

### farolero

I read some time ago a resume of the book the Crack In The Cosmic Egg and this is more or less what it told:

When a rocket acquires light speed its mass becomes infinite which creates a gravity force field that crunches all the universe making it restart.

Its argued that to propel a rocket to light speed you need infinite work but then your time is zero so lets check the equations:

Work=force by distance
Force=mass by acceleration
Acceleration=velocity by time

But time zero so velocity infinite so aceleration infinite so force infinite so work infinite

So how plausible do you think this book is?

2. Dec 14, 2016

### Vanadium 50

Staff Emeritus
If your description is accurate, not at all.

3. Dec 14, 2016

### Ibix

It's impossible to describe an object with mass travelling at the speed of light in relativity. So any conclusions drawn from relativity about what would happen if something with mass did travel at the speed of light are nonsense.

4. Dec 14, 2016

### Staff: Mentor

On these words of wisdom, thread closed.

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