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Old July 29 2013, 09:48 PM   #9
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Re: Alcubierre Drive - A thought excercise.

sojourner wrote: View Post
And hey, it was merely a thought exercise. I never said it was "realistic".
And so I can share my similar thought exercise, can't I?

I've long thought we'd be facing this problem with Andromeda, and while we'd have no problem firing a spacecraft into the galaxy (per my rough calculations), we'd have to send quite more than a single spacecraft that will end up be alone and helpless in an empty galaxy. We'd have to accelerate quite a big chunk of a mass to start a colony that could survive and spread with guarantees.

Thankfully, we'd have plenty of time to prepare and do it, but that will hardly solve all the complications (other star systems should be fairly easier, and regular trips can be of fairly small mass).

Regardless, while you may be able to match velocity vectors with the Andromeda galaxy as a whole, you still have to match vectors with a target star in that galaxy and then a planet within that star system. How big a rocket are you up to now?
Which is why I added "to a day or two" to account for delta-V expenses I could be missing at first glance, but matching the star's vector will be not more than twice the price of matching the other galaxy, and matching a planet in the system is cheap. I think the delta-V budget is less than the star's escape velocity budget (I could be wrong), and we've got four spacecrafts flying at escape velocity presently. I still think that you can do it with something as simple as a regular five-stage rocket.

PurpleBuddha wrote: View Post
The energy needed for the Alcubierre drive is a lot, even with the recent "revisions". Could this not also be used for a drive with more traditional thrust?
Wasn't it a bit more than the total amount of energy in the universe or something? It ought to be enough for anybody.
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