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We have seen that our inner light, as well as the outer light, suffers a certain hindrance in passing through a physical medium even such as the earth's gravity-field. Whilst we may not describe this retardation, as is usually done, in terms of a smaller velocity of light itself within the denser medium, we may rightly say that density has the effect of lessening the intensity of the light.

He had to return his crew, and there was something else. Several something elses. He arrived in that solar-system and put his yacht in a search-orbit, listening for the call-signal the spaceboat should give for him to home on. He found it, deep within the gravity-field of Darth. He maneuvered to come alongside, and there was blinding light everywhere. Alarms rang. Lights went out.

As the gravity-field decreases in strength with increasing distance from the centre of the field, that is, in the outward direction, so does the levity-field decrease in strength with increasing distance from its periphery, or in the inward direction. In both fields the direction of movement is from regions of lower to those of higher intensity.

In the atmosphere, to begin with, we find water in a state of vapour, in which the influence of the terrestrial gravity-field is comparatively weak. Floating in this state, the vapour condenses and crystallization proceeds. Obeying the pull of gravity, more and more crystals unite in their descent and gradually form flakes of varying sizes.

Dense white fog came out of it. There was motion. Calhoun followed the fog out of the lock. He carried objects which had been weightless, but were suddenly heavy in the ship's gravity-field. There were two spacesuits and a curious assortment of parcels. He spread them out, flipped aside his faceplate, and said briskly, "This stuff is cold! Turn a heater on it, will you, Maril?"

As we have seen, it is the centrically orientated gravity-field which gives the ball its permanency of shape. Consequently, the dynamic orientation of the material constituting its body is directed towards the interior of the body itself. Now, the moment we bring heat to bear on the body we find its surface moving in the outward direction.

The passage of a portion of matter from solid to liquid thus signifies that it ceases to possess a centre of gravity of its own and is now merely obedient to the general gravity-field of the earth. We can thus speak of a transition of matter from the individual to the planetary condition. This is what heat brings about when a solid body melts.

He carried objects which had been weightless, but were suddenly heavy in the ship's gravity-field. There were two space-suits and a curious assortment of parcels. He spread them out, flipped aside the face-plate, and said briskly; "This stuff is cold! Turn a heater on it, will you Maril?" He began to work his way out of his vacuum-suit. "Item," he said. "The ships are fuelled and provisioned.