In short periods of time the changes in the shapes and positions of the planetary orbits, in consequence of their mutual attractions, are of no great consequence. When, however, we bring thousands of years into consideration, then the displacements of the planetary orbits attain considerable dimensions, and have, in fact, produced a profound effect on the system.英文原著 · 《Great Astronomers》
Of Life in most august omnipresence, Through which the rational intellect would find In passion its expression, and mere sense, Ignoble else, lend fire to the mind, And being joined with it in harmony More mystical than that which binds the stars planetary,英文原著 · 《Charmides and Other》
As the shrinkage and corresponding increase of density proceed, the planetary spheroid becomes more and more elliptic, and the succession of forms constitutes a family classified according to the density of the liquid. The specific mark of this family is the flattening or ellipticity.英文原著 · 《Darwin and Modern Science》
Of course there were, as usual, a few incredulous people who refused to believe the assertion that four more moving bodies had to be added to the planetary system. They scoffed at the notion; they said the satellites may have been in the telescope, but that they were not in the sky. One sceptical philosopher is reported to have affirmed, that even if he saw the moons of Jupiter himself he would not believe in them, as their existence was contrary to the principles of common-sense!英文原著 · 《Great Astronomers》
In each case the planetary nature of the object had been overlooked, and it had been taken for granted that it was a star. It presented no difference which was sufficient to arrest attention.英文原著 · 《Great Astronomers》
So you lose your government support for the planetary mining base there.美剧 · 《Billions》
A tremendous accomplishment would be If the planetary body he discovered Were plummeting toward earth and he exploded it with his mind.美剧 · 《The Big Bang Theory》
And, if even all of the planetary systems in our galaxy were devoid of life, And, if even all of the planetary systems in our galaxy were devoid of life,演讲 · 《Join the SETI search ~ Jill Tarter》