World-life; Or, Comparative Geology, Parte 1S.C. Griggs, 1883 - 642 pagine |
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Parole e frasi comuni
acceleration Amer amount angular velocity assume atmosphere attraction axis body bright lines cause central centre of gravity centrifugal force centrifugal tendency comet conceived condensation condition constitution contraction cooling cosmical cosmical dust crust density diameter diminished direction distance dust earth earth's atmosphere equal equatorial ethereal exerted existence feet fluid force geological heat Herschel incandescent increased incrustation influence Jour Jupiter Jupiter's Laplace light liquid lunar mass matter meteoric meteorites meteoroidal miles moon moon's mountain move Nature nebula nebular theory nucleus ocean Omega Nebula orbit origin particles perihelion period phenomena planet planetary planetary nebula portion present pressure primitive probably Professor prolate radiation radius regions relative result retardation retrograde motion ring ringlet rotary rotation satellites Saturn sediments Siemens solar nebula solar system solid space spectrum spheroid spiral stage stars substance sun's supposed surface swarm temperature terrestrial tidal action tide tide-bearer tide-producer tion Uranus vapor zodiacal light zone
Brani popolari
Pagina 489 - Within a finite period of time past, the earth must have been, and within a finite period of time to come, the earth must again be, unfit for the habitation of man as at present constituted...
Pagina 602 - I figuratively called the laboratories of the universe, the stars forming these extraordinary nebulae, by some decay or waste of nature, being no longer fit for their former purposes, and having their projectile forces if any such they had. retarded in each other's atmosphere, may rush at last together, and either in succession, or by one general tremendous shock, unite into a new body. Perhaps the extraordinary and sudden blaze of a new star in Cassiopea's chair, in 1572, might possibly be of such...
Pagina 51 - Perhaps the whole frame of nature may be nothing but various contextures of some certain ethereal spirits or vapours, condensed as it were by precipitation...
Pagina 54 - we may conceive that in remote ages the temperature of matter was much higher than it is now, and that these other things [the ideal elements] existed in the state of perfect gases — separate -existences — uncombined.
Pagina 493 - It is impossible, by the unaided action of natural processes, to transform any part of the heat of a body into mechanical work, except by allowing heat to pass from that body into another at a lower temperature.
Pagina 109 - ... contraction of the mass.* The same conclusion may be reached from the principle that the angular velocities of two rotating spheroids having the same mass and the same angular momentum, but of different equatorial diameters, are to each other inversely as the squares of their radii of gyration.! The radius of gyration is the distance from the axis of rotation to the centre of gyration, or point within the mass at which we can conceive an opposing force applied which would completely arrest the...
Pagina 51 - ... and after condensation wrought into various forms; at first by the immediate hand of the Creator; and ever since by the power of nature...
Pagina 55 - The recent researches of Henry Ste. -Claire Deville and others go far to show that this breaking up of compounds, or dissociation of elements by intense heat, is a principle of .universal application ; so that we may suppose that all the elements which make up the sun or our planet would, when so intensely heated as to be in...
Pagina 53 - ... are gradually changing by atmospheric additions or subtractions, or by accretions or diminutions arising from nebulous substance or from meteoric bodies, so that no star or planet could at any time be said to be created or destroyed, or to be in a state of absolute stability, but that some may be increasing, others dwindling away, and so throughout the universe, in the past as in the future.
Pagina 87 - It is true, then, that contraction develops heat, and that its development delays final refrigeration; — that is, the progress toward final refrigeration is not as rapid as the amount of radiated heat implies. But it is not true that contraction (from cooling) can have developed the whole amount of heat at any time existing in the mass, or can even maintain a body at a constant temperature.