K    Some Additional Topics

In this chapter we give brief references to supplementary topics and present ideas for possible further study. The actual work will be left to the reader. The topics are diverse such as historical attempts to measure the speed of light, considerations concerning 'natural' units for physical entities, theoretical considerations for calculations of future travel to neighboring fixed stars, the use of alternative mathematical formalisms for the STR, representing STR with other diagram types and the difference between measuring and seeing in the STR. Many topics have ended up here – many which I would have gladly dealt with directly but which would have given the book a discouraging length. Furthermore, you should now be very well prepared to tackle these topics independently!


Hot young stars shine brightly in the gas and dust cloud of the Small Magellanic Cloud.
An image from the Hubble Space Telescope – the heic0702a image © ESA and NASA.