What'd Make a Better Rocket, Nuclear or Ion Engines?(wired.com)
wired.com
What'd Make a Better Rocket, Nuclear or Ion Engines?
http://www.wired.com/2015/10/whatd-make-better-rocket-nuclear-ion-engines/?mbid=social_twitter
http://www.wired.com/2015/10/whatd-make-better-rocket-nuclear-ion-engines/?mbid=social_twitter
Note there are other kinds of "nuclear engines", including one where you use a nuclear reactor to power an ion drive.