1. Navigation and Energy

2.  delta DOR  Track spacecraft simultaneously  Record quasar’s wavefronts  Triangulation yields spacecraft’s angular position Delta-DOR Principle « Arpsoft. http://www.arpsoft.it/products- and-services/delta-dor-readmore/

3. Trajectory Correction Maneuvers ◦ Compute vector required to correct the trajectory. ◦ Timing  Small change can be done immediately ◦ Rotate and use thrusters Delta-DOR Principle « Arpsoft. http://www.arpsoft.it/products- and-services/delta-dor-readmore/

4. Orbit Trim Maneuvers ◦ Adjusts  Instrument’s field of view  Sensitivity of gravity field  Prevent orbital decay ◦ Changes to either:  Periapsis – closest point  Apoapsis – furthest point Delta-DOR Principle « Arpsoft. http://www.arpsoft.it/products- and-services/delta-dor-readmore/

8. Interstellar Travel Fuel Source Spacecraft Velocity Travel Time Effect on Human