| A simple way to demonstrate the sign of gravitational energy is to imagine a thin spherical shell of mass. |
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| The object can then be said to be endowed with a gravitational energy that could cause it to fall back to its original position. |
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| Ascent of magma and construction of volcanoes, however, are not driven by thermal energy but by gravitational energy. |
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| The energy source of gravitational energy seems to be the diminishing rest mass of the radiating system, for example of a binary star. |
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| Even allowing for a planetary body the size of Jupiter, chemotrophy and phototrophy would still out-compete gravitational energy. |
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| All the planets should have started warm, when gravitational energy was transformed into heat during planetary accretion. |
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| The total luminous energy emitted by the black hole in such a hypothetical outburst is ten times larger than the gravitational energy of the gas in the central molecular zone. |
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| The energy of motion of the universe, its kinetic energy, is larger than its gravitational energy and the explosion which began the universe will never end. |
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| Instability to collapse is a consequence of the fact that the released gravitational energy is essentially all radiated away, so that the thermal energy stays well below the gravitational energy. |
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| On the one hand this is the energy stored in the interior of the earth resulting from the gravitational energy generated during the formation of the earth. |
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| At that time the gravitational energy was the only source known which could deliver such enormous amounts of energy as were demanded by the stellar context. |
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| We have seen that if the ratio of magnetic to gravitational energy is to be as small as inferred from observation, the accumulation length must be ludicrously long. |
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| A promising energy generation process in principle is the gravitational energy of mass falling onto a very massive body, assuming the energy can be converted into radiation. |
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| Jiggle a mass to and fro and it will send out waves of gravitational energy, akin to the way a ball that is bounced on a trampoline sends vibrations across the canvas. |
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| Light proceeds using a waveform in the pervasive gravitational energy field at a relatively constant speed, like sound in the air. |
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| This in turn generated more gravitational energy, which enabled a thicker, more stable, longer-lasting crust to form. |
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| But there could also be a heat source or gravitational energy source or even radiogenic sources of energy. |
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| Energy is being stored in the form of the gravitational energy potential of water, which is pumped from a reservoir at lower level to another reservoir at higher altitude, when there is abundant or cheap energy in the system. |
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| Just as a ball rolling to the bottom of a hill loses gravitational energy, a neutron falling into, and being captured by, a nucleus also loses energy. |
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| They subsequently contract on a time scale of tens of millions of years, the main source of radiant energy in this phase being the release of gravitational energy. |
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| Renewable energy commodities, apart from geothermal energy, are drawn directly or indirectly from current or recent flows of the constantly available solar and gravitational energy. |
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| They pointed out that cold gas streaming into a massive protogalaxy would heat up from the gravitational energy gained by falling in and would glow of its own accord as a way of cooling off. |
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| The space-time metric tensor not only encodes for spatiotemporal structure, but also represents the gravitational potentials, and thus gravitational energy. |
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| By the time they were a few hundred miles apart, they were whipping around at nearly the speed of light, releasing great shudders of gravitational energy. |
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| Hilbert had observed that the conservation of energy seemed to be violated in general relativity, due to the fact that gravitational energy could itself gravitate. |
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| Gravity causes the protostar to shrink, and the gravitational energy lost by the inflowing matter turns into heat, causing the centre of the globule to become very hot. |
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