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*To*: "'LIT Starship Design Group'" <starship-design@lists.uoregon.edu>*Subject*: starship-design: Black holes and the rocket equation*From*: Steve VanDevender <stevev@efn.org>*Date*: Wed, 13 Aug 1997 21:33:19 -0700*In-Reply-To*: <01BCA81F.0D0F72A0@x2p2.gnt.com>*References*: <01BCA81F.0D0F72A0@x2p2.gnt.com>*Reply-To*: Steve VanDevender <stevev@efn.org>*Sender*: owner-starship-design

L. Parker writes: > Let's nip this one in the bud early on, do you guys want to make a stab at > guessing the MASS of a black hole? Tell me how you are going to get enough > thrust out of the black hole to MOVE it.... Who needs to guess? Black holes can be any size you want. Unless a successful quantum gravity theory puts a minimum limit on black hole size based on the size of a quantum of space, there's no size minimum and hence no mass minimum, If I remember correctly, R = G * M/(2 * c^2): R = Schwarzchild radius, M = mass, G = gravitational constant, c = speed of light. Small black holes also make better thrusters; they evaporate much, much faster. Any stellar-sized black hole doesn't evaporate quickly enough to be useful for that purpose.

**Follow-Ups**:**Re: starship-design: Black holes and the rocket equation***From:*"Kyle R. Mcallister" <stk@sunherald.infi.net>

**References**:**starship-design: Black holes and the rocket equation***From:*"L. Parker" <lparker@cacaphony.net>

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