I'm building a bubble around my spaceship to protect from "drag" at 
interstellar velocities. This site says that for subsonic craft a 
parabola is a better shape for the nose. However, an ogive is better at 
supersonic speeds.

http://www.aerospaceweb.org/question/aerodynamics/q0151.shtml

Which applies in outer space? Or, should I not use either and use a 
teardrop shape instead?

And, is the piriform shape a good one to use? See here:

http://csi.chemie.tu-darmstadt.de/ak/immel/script/redirect.cgi?filename=http://csi.chemie.tu-darmstadt.de/ak/immel/graphics/povray35/teardrop.html

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