Planeteer

“ The plane of the orbit of his planet being supposed to pass through the center of the spherical system, our observer would, during his year, behold the night at one season blazing with the splendors of the clustered suns, and at another emptied of brilliant orbs and faintly lighted with the soft glow of the Milky-Way and the feeble flickering of distant stars, scattered over the dark vault. ”

“ Radio transmitters serving as beacons for space navigation may exist on both Venus and Jupiter.
“These spacecraft can perform maneuvers that, on earth, are possible only for rays of light. They fly at speeds of many thousands of miles an hour, can reverse direction instantaneously at any speed, ascend or descend vertically, and hover motionless in the air. They accomplish these feats perhaps by using the power of cosmic rays and by generating and manipulating artificial gravitational fields, which they could also use to prevent the transmission of sound waves and to become invisible. ”

“ The boy who plays Mercury, puts down only one for his planet; the boy who plays Venus does the same; he who plays the Earth, has to put down one for the Earth, and one for the Moon, its satellite; the boy who plays Mars puts down Mars and the four satellites that lie between the orbits of Mars and Jupiter; the boy who plays Saturn puts down one for the planet, and draws a ring round it, outside of which he puts the seven satellites in any position he chooses; the boy who plays the planet Herschel, puts down one for the planet, and six for the satellites. ”

“ OUTER PLANETS EXPLORATION. It is the sense of Congress that the outer solar system planets and their satellites can offer important knowledge about the formation and evolution of the solar system, the nature and diversity of these solar system bodies, and the potential for conditions conducive to life beyond Earth. NASA should move forward with plans for an Outer Planets flagship mission to the Europa-Jupiter system or the Titan-Saturn system as soon as practicable within a balanced Planetary Science program. ”

“ An extensive study of the outer solar system is recognized by us to be one of the major objectives of space science in this decade. This endeavor is made particularly exciting by the rare opportunity to explore several planets and satellites in one mission using long-lived spacecraft and existing propulsion systems. ”

“ But if we admit that the substance of which the solar system consists once existed in a nebulous condition, and was in rotation, all the above peculiarities follow as necessary mechanical consequences. Nay, more, the formation of planets, the formation of satellites and of asteroids, is accounted for. We see why the outer planets and satellites are larger than the interior ones; why the larger planets rotate rapidly, and the small ones slowly; why of the satellites the outer planets have more, the inner fewer. ”

“ The thorium had never been exposed to oxygen. Here and there, pyramids of metal thrust up from the asteroid, sometimes singly, sometimes in clusters. They were metal crystal formations. He guessed that once, long ages ago, the asteroid had been a part of something much bigger, perhaps a planet. One theory said the asteroids were formed when a planet exploded. This asteroid might have been a pocket of pure thorium in the planet.
There would be plenty to do in a short while, but meanwhile he enjoyed the sensation of being on a tiny world in space with only a handful of Planeteers for company. ”

“ There are thousands of millions of suns in our galaxy, and not less than one in three has planets, and among these myriads of unknown worlds there will be thousands with seas and land and clouds and continents, fit for men to enter upon, there to rear their cities. There will be starships roaming distant sun-clusters, and landing on planets in the Milky Way. We ourselves will see freight-lines to Rigel and Arcturus, and journey on passenger-liners singing through the void to Andromeda and Aldebaran! ”

“ Suppose his funeral rocket landed upon some other planet or, drawn by the pull of the great sun, were thrown into the flaming folds of the incandescent sphere? Then the rocket might continue on out of the solar system, plunging through the endless seas of space for millions of years, to finally enter the solar system of some far-off star, as meteors often enter ours. Suppose his rocket crashed upon a planet, or the star itself, or became a captive satellite of some celestial body? ”

“ Also in the past two decades, automated spacecraft explored Mercury, Venus, Mars, Jupiter and Saturn, while telescopes above the earth's atmosphere gave us new eyes to learn about our universe--the strange world of pulsars, quasars and black holes. ”

“ If it were quite immaterial to the welfare of the planetary system whether all the planets moved the same way, or whether some moved one way and some another, then the nebular hypothesis would be entitled to all the support which could be derived from the circumstances of the case. Take, for instance, the eight principal planets—Mercury, Venus, the Earth, Mars, Jupiter, Saturn, Uranus, Neptune. All these planets move in the same way around the sun. ”

“ If you threw a satellite away from its path around Earth and directly into Earth's wake, but at a speed less than Earth's forward speed in its orbit, the satellite would break free, but would continue in Earth's orbital direction. And then with a brief side-blast, you could warp into an orbit around the Sun all your own, or—into that of the planet Venus, if you chose....
And beneath that eternal shell of cloud—who knew?
He had his computers. He had his reference-tapes. He had his refractor and his scanners, and his star-charts and his precious store of fuel. ”

“ In Jupiter you would see creatures similar to those in Saturn, but with different powers of locomotion; in Mars and Venus you would find races of created forms more analogous to those belonging to the Earth; but in every part of the planetary system you would find one character peculiar to all intelligent natures, a sense of receiving impressions from light by various organs of vision, and toward this result you can not but perceive that all the arrangements and motions of the planetary bodies, their satellites and atmospheres, are subservient. ”

“ The planets are wanderers. Each day they move to a new position among the constellations. Astronomers and navigators have learned the paths of the planets and the positions of the brightest fixed stars, but most of us, when we look up at the night sky and see a brilliant stranger among the familiar star groups, must cudgel our brains to account for it. According to our dispositions, we may consult a newspaper or telephone an observatory to find out the name of the intruder, or we may conclude that the unknown is an alien spacecraft. ”

“ Planetary satellites are a characteristic of our solar system, and now that the able astronomers at Washington have shewn that Mars has two moons, that mythological deity ceases to be exceptional. Neither in rate of motion nor in distance from the planet is there agreement between the two; for we are informed by Mr Christie of the Greenwich Observatory, that 'the outer satellite revolves once in less than a day and a quarter, and the inner three and a quarter times in one day. ”

“ After ten more years the Sun would be unable to support its family. The planets they now inhabited—Earth, Venus and Mercury—were supported artificially. The atmospheres of all the planets had long since slowly dissipated into space, and with them had gone the water. These vital things were being replaced constantly by transmutation of the elements of the rocks of the planets. Long ages ago Earth had had a large satellite, which had been used through the ages to supply energy for the factories of man, and to supply the necessary atmosphere. ”

“ As they sped along, many things were explained to them concerning the various solar systems and especially the one we call ours. This they learned consists of the Sun, Moon, Mercury, Mars, Venus, Earth, Jupiter, Saturn, Uranus and Neptune, with accompanying satellites, besides innumerable fixed and moving stars; and ours is only one of many solar systems.
One of the things the guide pointed out filled the party with awe and wonder. Reflected on the clear blue vault above them was a continuous moving panorama of everything that was taking place upon the earth beneath them. ”

“ She has but one satellite, while Jupiter, Uranus, Saturn, Neptune have each several, an advantage by no means to be despised. But that which renders our own globe so uncomfortable is the inclination of its axis to the plane of its orbit. ”

“ The solution is—there are nine planets in this solar system! Neptune and Uranus are each far vaster than Earth; they are utterly impossible for life as we know it, but a small colony might be established there to refine metals for the distant Earth. We might be able to build domed and sealed cities. But first we could try the nearer planets—Mars, Venus, or some satellites such as our Moon. I certainly hope that this machine will make it possible. ”

“ On September 3, the CC&S initiated the Earth acquisition sequence. The gyroscopes were turned on, the cruise scientific instruments were temporarily switched off, and a search for the Earth began about the roll axis of the spacecraft.
During this maneuver, the long axis of the spacecraft was held steady in a position pointing at the Sun and the gas jets rolled the spacecraft around this axis until the sensors, mounted in the directional antenna, could “see” the Earth. ”

“ In addition to the five or six large planets in each group, which, however, are many millions of miles apart, there is in some clusters a small planet that swings backward and forward across the common centre, like a pendulum, but in nearly a straight line; and while this multiplicity of motion goes on, the whole aggregation sweeps majestically around Sirius, its mighty sun. Our little solar system contains, as we know, about one thousand planets, satellites, and asteroids large enough to be dignified by the name of heavenly bodies. ”

“ The apparatus, practically as you see it here, was discovered but a short time ago, in a small, rocket-propelled space-ship which we found some distance outside of the orbit of Jupiter. Its source of power had been destroyed by the cold of outer space, but re-powering it was, of course, a small matter. The crew of the vessel were all dead. They were, however, of human stock, and of a type adapted for life upon a satellite. I deduce, from your compact structure, your enormous atmospheric pressure, and your, to us, unbelievably high body temperature, that you must be planet-dwellers. ”

“ If we consider the other bodies of our system, such, for instance, as Venus or Jupiter, we find that the orbit of Venus also lies in a plane, and that plane also passes through the centre of the sun. The orbit of Jupiter is found to be contained within a plane, and it, too, passes through the sun’s centre. Each of the remaining planets in like manner is found to revolve in an orbit which is contained in a plane, and all these planes have one common point, that point being the centre of the sun. ”

“ Our scientists have spent centuries in perfecting a machine for interplanetary flight. We have long had the necessary power. The problem was to determine the relative position of the two planets, the pull of gravity of the sun, Venus and your earth, the time necessary to make the flight, the provisioning and ventilating of the projectile, the perfecting of a device to detect and repel meteorites, and countless other problems, all vitally important. ”

“ Calling Earth – Calling Earth! The existence of your planet and and all the planets of the Sun’s family is threatened with extinction. You must speed every effort to build a space ship to take part with your sister planets in repulsing a common enemy. This is the fiftieth broadcast in an effort to reach you. We hope that this message is being heard. You must arrive within a year of Earth time on Luna where, at Copernicus, a meeting of the planets will be held. I shall now give the plans for the construction of a space-ship that will assure your arrival... ”

“ One of them is, that each set of satellites repeats in miniature the relations of the planets to the sun, both in the respects just named, and in the order of the sizes. On progressing from the outside of the Solar System to its centre, we see that there are four large external planets, and four internal ones which are comparatively small. A like contrast holds between the outer and inner satellites in every case. ”

“ We shall begin with the planets nearest to the sun, and then we shall gradually proceed outwards to one planet after another, until we reach the confines of the system. We shall find much to occupy our attention. Each planet is itself a globe, and it will be for us to describe as much as is known of it. The satellites by which so many of the planets are accompanied possess many points of interest. The circumstances of their discovery, their sizes, their movements, and their distances must be duly considered. ”

“ I speak to you now through the electronic instrumentation which has been created for me, and I come to offer your planet not merely a threat, a promise, or an easy solution—but a challenge."
The council room stirred.
"Your earth satellites have been viewed with interest by the astronomers of our world, and we foresee the day when contact between our planets will be commonplace. As for ourselves, we have hitherto had little desire to explore beyond our realm, being far too occupied with internal matters. ”