A Happy Refrain

The conductor of the symphony is played by Mark Graham, who is the head of music preparation for the series and has been doing music for movies and television since 1980. This is his first acting credit.

When the ship is visiting the binary stars, it shows them as being so close that their chromospheres are literally touching. This is not possible because the mutual gravity would have long ago torn them apart. In reality, binary star systems are much more disperse. For example, in a "tight" system like Alpha Centauri the stars are 18 AU apart (an AU is the average distance of Earth from the Sun). Some wide binaries, on the other hand, have separations greater than 1000 AU.

References Singin' in the Rain (1952)