Rendezvous With Rama - Arthur C. Clarke [96]
As to the nature of that drive, one thing was now certain, even though all else was mystery. There were no jets of gas, no beams of ions or plasma thrusting Rama into its new orbit. No one put it better than Sergeant-Professor Myron when he said, in shocked disbelief: 'There goes Newton's Third Law.'
It was Newton's Third law, however, upon which Endeavour had to depend the next day, when she used her very last reserves of propellant to bend her own orbit outwards from the sun. The change was slight, but it would increase her perihelion distance by ten million kilometres. That was the difference between running the ship's cooling system at ninety-five per cent capacity—and a certain fiery death.
When they had completed their own manoeuvre, Rama was two hundred thousand kilometres away, and difficult to see against the glare of the sun. But they could still obtain accurate radar measurements of its orbit; and the more they observed, the more puzzled they became.
They checked the figures over and over again, until there was no escaping from the unbelievable conclusion. It looked as if all the fears of the Hermians, the heroics of Rodrigo, and the rhetoric of the General Assembly, had been utterly in vain.
What a cosmic irony, said Norton as he looked at his final figures, if after a million years of safe guidance Rama's computers had made one trifling error—perhaps changing the sign of an equation from plus to minus.
Everyone had been so certain that Rama would lose speed, so that it could be captured by the sun's gravity and thus become a new planet of the solar system. It was doing just the opposite.
It was gaining speed—and in the worst possible direction.
Rama was falling ever more swiftly into the sun.
45
Phoenix
As the details of its new orbit became more and more clearly defined, it was hard to see how Rama could possibly escape disaster. Only a handful of comets had ever passed as close to the sun; at perihelion, it would be less than half a million kilometres above that inferno of fusing hydrogen. No solid material could withstand the temperature of such an approach; the tough alloy that comprised Rama's hull would start to melt at ten times that distance.
Endeavour had now passed its own perihelion, to everyone's relief, and was slowly increasing its distance from the sun. Rama was far ahead on its closer, swifter orbit, and already appeared well inside the outermost fringes of the corona. The ship would have a grandstand view of the drama's final stage.
Then, five million kilometres from the sun, and still accelerating, Rama started to spin its cocoon. Until now it had been visible under the maximum power of Endeavour's telescopes as a tiny bright bar; suddenly it began to scintillate, like a star seen through horizon mists. It almost seemed as if it was disintegrating. When he saw the image breaking up, Norton felt a poignant sense of grief at the loss of so much wonder. Then he realized that Rama was still there, but that it was surrounded by a shimmering haze.
And then it was gone. In its place was a brilliant, star-like object, showing no visible disc—as if Rama had suddenly contracted into a tiny ball.
It was some time before they realized what had happened. Rama had indeed disappeared: it was now surrounded by a perfectly reflecting sphere, about a hundred kilometres in diameter. All that they could now see was the reflection of the sun itself, on the curved portion that was closest to them. Behind this protective bubble, Rama was presumably safe from the solar inferno.
As the hours passed, the bubble changed its shape. The image of the sun became elongated, distorted. The sphere was turning into an ellipsoid, its long axis pointed in the direction of Rama's flight. It was then that the first anomalous reports started coming in from the robot observatories, which, for almost two hundred years, had been keeping a permanent watch on the sun.
Something was happening to the solar magnetic field, in the region around Rama. The