The ship passes Pluto. Their speed makes the planet appear blue. After they pass, it changes to red.
Pluto's moon, Charon, was not discovered until 1978.
A course correction avoids some asteroids.
Asteroids are also seen in The Mark of Archanon. Brian Johnson would attempt even more ambitious asteroids in The Empire Strikes Back.
Tom Bowen eats from a Hampa-Pak picnic tray, also used in many 1999 episodes. The calculators in front of him were all used by Bergman.
They arrive at the triple-star system of Alpha Centauri.
A star cluster seen as they travel to Alpha Centuri is seen later in One Moment Of Humanity.
They launch satellites to transmit data back to Earth.
Tom's slide-rule was used by Bergman in Testament Of Arkadia. The satellite panel is seen clearly in Seed Of Destruction. One of the satellites can be seen in the spaceship graveyard in The Metamorph.
The crew vote on whether to return to Earth. They decide to continue their journey into space.
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Images copyright Gerry Anderson Productions
Page copyright Martin Willey