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Updated: May 24, 2025
The landing-grid locked on, raised the small spacecraft until Weald was a great shining ball below it, and then somehow scornfully cast him off. The Med Ship was free, in clear space where there was not enough of a gravitational field to hinder overdrive. He aimed for his destination, his face very grim. He said savagely, "Get set, Murgatroyd! Overdrive coming!"
Maiorana discovered that lead balls swimming on a pool of mercury lost a certain amount of weight. It was explained that the weight was lost due to a screening effect which the mercury produced on the lead balls. In other words, mercury acts as a sort of insulator against the earth's gravitational waves. For gravitation certainly is propagated the same as other forms of energy, i.e., in wave form.
Knowing the force of gravity on a planet, it is easy to calculate the velocity with which a body, or a particle, would have to start radially from the planet in order to escape from its gravitational control. For the earth this critical velocity is about seven miles per second; for Mars about three miles per second.
In every stateroom and in every lounge and saloon speakers sounded a warning: "For a short time, while we are pulling clear of the gravitational field of the Earth, walking will be somewhat difficult, as everything on board will apparently increase in weight by about one-fifth of its present amount. Please remain seated, or move about with caution.
They no longer lie at random and unrelated, apart from the inconspicuous gravitational effect they exert on one another, but are drawn into a coherent whole, thus acquiring properties resembling those of an ordinary piece of solid matter.
In the older conception, however, the gravitational behaviour 'cold' was seen to be counteracted by an autonomous anti-gravitational behaviour 'warm'. Experience still supported the conviction that as a polar opposite to the world subject to gravity, there was another world subject to levity.
Outlined in a few words, it is an attempt to explain all the major phenomena of the universe as due, directly or indirectly, to the gravitational impact of such meteoric particles, or specks of cosmic dust, as comets are composed of.
But that identity was not ascertained until Savary of Paris showed, in 1827, that the movements of the above-named binary in the Great Bear could be represented with all attainable accuracy by an ellipse calculated on orthodox gravitational principles with a period of 58-1/4 years.
"Then the energy went somewhere else, but the block is still around somewhere. They can be moved around all you want, but the Legos themselves are indestructible." "OK, that's fairly simple," said the Director. "Now here's the problem. We have a kind of energy called potential energy, and specifically I mean gravitational potential energy. All potential energy is based on position, right?"
Our space control drive does not use up energy except in the presence of a strong gravitational field; most of it is drained back into our storage coils, with very little loss. But we have used it several times near a large sun, and the power drainage goes up exponentially. We would not have enough to get back home if we happened to run into any more trouble on the way."
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