http://apcnasa3ozl2j74htizuzba5b6nhugbg2qze2nrz43siunkct555fpid.onion
For example, the ballistic minimum energy (Hohmann) trip time from the Earth to Neptune is roughly 30 years; a low-T/W electric propulsion system can reduce this trip time to about 10 years. (Note however that ballistic trip times can be dramatically reduced by using gravity assists from Jupiter, Saturn, etc., as was done in the Voyager spacecraft mission.)