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For anything else of the same size, gravity has pulled and crushed material so that surface irregularities are small compared with the whole body. But Hyperion is one big irregularity, in every way. Its low density suggests that its appearance of a sponge or a cinder is carried down into its interior. It is a moon full of holes. Its orbit and spin behaviors are every bit as eccentric as its shape and its structure. The time for one journey around Saturn varies from one orbit to the next, thanks to the influence of its larger neighbor, Titan; and its axis of spin tumbles chaotically.

In the event, however, the comet was quite faint. It seems that Kohoutek was more rocky than it might have been, less icy, and not subject enough to the assault of the Sun’s beams for growth of an impressive halo of loose matter around it. Those beams did, however, drag enough material away from the comet to create its tail, always ribboning away from the Sun. Now the comet has returned to the darkness, providing a metaphor for others who leave us behind. The object Comet Kohoutek The comet, named after the Czech astronomer who discovered it as it approached us in early 1973, was visible with the naked eye, showing both its nebulous shape around the core and its long tail of material streaming away from the Sun.

Neptune has a diameter that is much less than a millionth of the distance across the whole Solar System, which itself is tiny compared to the distance to the nearest star, and tiny again compared with a galaxy. The image is a useful one, showing some detail on the surface of the planet and also the four moons Proteus (the brightest, at the top), Larissa, Despina, and Galatea. But compare it with the close-ups taken by the Cassini spacecraft in its orbits around Saturn and its fly-bys of its moons, or indeed with the image of Neptune’s own moon, Triton, as pictured by Voyager 2 during its fly-by back in 1989.

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