The Earth's Beginning

actual Aldebaran argument asteroids astronomers attraction axis ball bodies carbon celestial centre chapter cluster coal collision combustion contraction course density depth direction discovery distance doubt earth earth's crust earthquake ecliptic elements equal evolution explain fact gaseous globe gradually greater heavens hole illustration increase internal heat Isaac Roberts Isle of Wight Jupiter Krakatoa Laplace Lick Observatory light Lord Rosse mass material miles million moment of momentum momentum moon motion movements moving Nature Nebula in Orion nebular theory Neptune object observation Observatory orbits original oxygen particles period perpendicular photograph planets pound present primæval nebula principal plane produced quantity of energy quantity of heat radiation remarkable revolves round rocks rotation round the sun satellites of Uranus Saturn seismometer shell solar system solid space spectra spectrum spiral nebula stars sufficient sun's suppose surface telescope temperature thousand tion Uranus vapour velocity