The Starship Engineer's Notebook

 During our recent diversion into imaginary time, we saw that using the imaginary unit to indicate time can simplify our efforts to express...

  When we discussed the metric before, in the context of deriving the Lorentz Group , it served to generalize the concept of the dot produc...

We've looked at how forces can be described in relativistic mechanics, but not yet discussed how the fields producing them change.  It...

In our previous entry in our introduction to special relativity, we introduced the interval, or proper time, which provides a four-dimensio...

 There are two important, well-known rules about interstellar travel:  Nothing can travel faster than light.  If you want to get anywhere i...