From a philosophical point of view, Leibniz's most interesting argument was that absolute space conflicted with what he called the principle of the identity of indiscernibles (PII). PII says that if two objects are indiscernible, then they are identical, i.e. they are really one and the same object. What does it mean to call two objects indiscernible? It means that no difference at all can be found between them--they have exactly the same attributes. So if PII is true, then any two genuinely distinct objects must differ in at least one of their attributes--otherwise they would be one, not two. PII is intuitively quite compelling. It certainly is not easy to find an example of two distinct objects that share all their attributes. Even two mass-produced factory goods will normally differ in innumerable ways, even if the differences cannot be detected with the naked eye.Leibniz asks us to imagine two different universes, both containing exactly the same objects. In Universe One, each object occupies a particular location in absolute space.In Universe Two, each object has been shifted to a different location in absolute space, two miles to the east (for example). There would be no way of telling these two universes apart. For we cannot observe the position of an object in absolute space, as Newton himself admitted. All we can observe are the positions of objects relative to each other, and these would remain unchanged--for all objects are shifted by the same amount. No observations or experiments could ever reveal whether we lived in universe One or Two.

Bowman was aware of some changes in his behavior patterns; it would have been absurd to expect anything else in the circumstances. He could no longer tolerate silence; except when he was sleeping, or talking over the circuit to Earth, he kept the ship's sound system running at almost painful loudness. / At first, needing the companionship of the human voice, he had listened to classical plays--especially the works of Shaw, Ibsen, and Shakespeare--or poetry readings from Discovery's enormous library of recorded sounds. The problems they dealt with, however, seemed so remote, or so easily resolved with a little common sense, that after a while he lost patience with them. / So he switched to opera--usually in Italian or German, so that he was not distracted even by the minimal intellectual content that most operas contained. This phase lasted for two weeks before he realized that the sound of all these superbly trained voices was only exacerbating his loneliness. But what finally ended this cycle was Verdi's Requiem Mass, which he had never heard performed on Earth. The "Dies Irae," roaring with ominous appropriateness through the empty ship, left him completely shattered; and when the trumpets of Doomsday echoed from the heavens, he could endure no more. / Thereafter, he played only instrumental music. He started with the romantic composers, but shed them one by one as their emotional outpourings became too oppressive. Sibelius, Tchaikovsky, Berlioz, lasted a few weeks, Beethoven rather longer. He finally found peace, as so many others had done, in the abstract architecture of Bach, occasionally ornamented with Mozart. / And so Discovery drove on toward Saturn, as often as not pulsating with the cool music of the harpsichord, the frozen thoughts of a brain that had been dust for twice a hundred years.

Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there-on a mote of dust suspended in a sunbeam.The Earth is a very small stage in a vast cosmic arena. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot.Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves.The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand.It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known.

On a long flight, after periods of crisis and many hours of fatigue, mind and body may become disunited until at times they seem completely different elements, as though the body were only a home with which the mind has been associated but by no means bound. Consciousness grows independent of the ordinary senses. You see without assistance from the eyes, over distances beyond the visual horizon. There are moments when existence appears independent even of the mind. The importance of physical desire and immediate surroundings is submerged in the apprehension of universal values.For unmeasurable periods, I seem divorced from my body, as though I were an awareness spreading out through space, over the earth and into the heavens, unhampered by time or substance, free from the gravitation that binds to heavy human problems of the world. My body requires no attention. It's not hungry. It's neither warm or cold. It's resigned to being left undisturbed. Why have I troubled to bring it here? I might better have left it back at Long Island or St. Louis, while the weightless element that has lived within it flashes through the skies and views the planet. This essential consciousness needs no body for its travels. It needs no plane, no engine, no instruments, only the release from flesh which circumstances I've gone through make possible.Then what am I – the body substance which I can see with my eyes and feel with my hands? Or am I this realization, this greater understanding which dwells within it, yet expands through the universe outside; a part of all existence, powerless but without need for power; immersed in solitude, yet in contact with all creation? There are moments when the two appear inseparable, and others when they could be cut apart by the merest flash of light.While my hand is on the stick, my feet on the rudder, and my eyes on the compass, this consciousness, like a winged messenger, goes out to visit the waves below, testing the warmth of water, the speed of wind, the thickness of intervening clouds. It goes north to the glacial coasts of Greenland, over the horizon to the edge of dawn, ahead to Ireland, England, and the continent of Europe, away through space to the moon and stars, always returning, unwillingly, to the mortal duty of seeing that the limbs and muscles have attended their routine while it was gone.

Like the most of you, I was raised among people who knew - who were certain. They did not reason or investigate. They had no doubts. They knew that they had the truth. In their creed there was no guess — no perhaps. They had a revelation from God. They knew the beginning of things. They knew that God commenced to create one Monday morning, four thousand and four years before Christ. They knew that in the eternity — back of that morning, he had done nothing. They knew that it took him six days to make the earth — all plants, all animals, all life, and all the globes that wheel in space. They knew exactly what he did each day and when he rested. They knew the origin, the cause of evil, of all crime, of all disease and death.At the same time they knew that God created man in his own image and was perfectly satisfied with his work... They knew all about the Flood -- knew that God, with the exception of eight, drowned all his children -- the old and young -- the bowed patriarch and the dimpled babe -- the young man and the merry maiden -- the loving mother and the laughing child -- because his mercy endureth forever. They knew too, that he drowned the beasts and birds -- everything that walked or crawled or flew -- because his loving kindness is over all his works. They knew that God, for the purpose of civilizing his children, had devoured some with earthquakes, destroyed some with storms of fire, killed some with his lightnings, millions with famine, with pestilence, and sacrificed countless thousands upon the fields of war. They knew that it was necessary to believe these things and to love God. They knew that there could be no salvation except by faith, and through the atoning blood of Jesus Christ.Then I asked myself the question: Is there a supernatural power -- an arbitrary mind -- an enthroned God -- a supreme will that sways the tides and currents of the world -- to which all causes bow?I do not deny. I do not know - but I do not believe. I believe that the natural is supreme - that from the infinite chain no link can be lost or broken — that there is no supernatural power that can answer prayer - no power that worship can persuade or change — no power that cares for man.Is there a God?I do not know.Is man immortal?I do not know.One thing I do know, and that is, that neither hope, nor fear, belief, nor denial, can change the fact. It is as it is, and it will be as it must be.We can be as honest as we are ignorant. If we are, when asked what is beyond the horizon of the known, we must say that we do not know. We can tell the truth, and we can enjoy the blessed freedom that the brave have won. We can destroy the monsters of superstition, the hissing snakes of ignorance and fear. We can drive from our minds the frightful things that tear and wound with beak and fang. We can civilize our fellow-men. We can fill our lives with generous deeds, with loving words, with art and song, and all the ecstasies of love. We can flood our years with sunshine — with the divine climate of kindness, and we can drain to the last drop the golden cup of joy.

Dear Neil Armstrong,I write this to you as she sleeps down the hall. I need answers I think only you might have. When you were a boy, and space was simple science fiction, when flying was merely a daydream between periods of History and Physics, when gifts of moon dust to the one you loved could only be wrapped in your imagination.. Before the world knew your name; before it was a destination in the sky.. What was the moon like from your back yard?Your arm, strong warm and wrapped under her hair both of you gazing up from your back porch summers before your distant journey. But upon landing on the moon, as the earth rose over the sea of tranquility, did you look for her? What was it like to see our planet, and know that everything, all you could be, all you could ever love and long for.. was just floating before you. Did you write her name in the dirt when the cameras weren't looking? Surrounding both your initials with a heart for alien life to study millions of years from now? What was it like to love something so distant? What words did you use to bring the moon back to her? And what did you promise in the moons ear, about that girl back home? Can you, teach me, how to fall from the sky?I ask you this, not because I doubt your feat, I just want to know what it's like to go somewhere no man had ever been, just to find that she wasn't there. To realize your moon walk could never compare to the steps that led to her. I now know that the flight home means more. Every July I think of you. I imagine the summer of 1969, how lonely she must have felt while you were gone.. You never went back to the moon. And I believe that's because it dosen't take rockets to get you where you belong. I see that in this woman down the hall, sometimes she seems so much further. But I'm ready for whatever steps I must take to get to her.I have seem SO MANY skies.. but the moon, well, it always looks the same. So I gotta say, Neil, that rock you landed on, has got NOTHING on the rock she's landed on. You walked around, took samples and left.. She's built a fire cleaned up the place and I hope she decides to stay.. because on this rock.. we can breath.Mr. Armstrong, I don't have much, many times have I been upside down with trauma, but with these empty hands, comes a heart that is often more full than the moon. She's becoming my world, pulling me into orbit, and I now know that I may never find life outside of hers. I want to give her EVERYTHING I don't have yet.. So YES, for her, I would go to the moon and back.... But not without her. We'd claim the moon for each other, with flags made from sheets down the hall. And I'd risk it ALL to kiss her under the light of the earth, the brightness of home... but I can do all of that and more right here, where she is..And when we gaze up, her arms around ME, I will NOT promise her gifts of moon dust, or flights of fancy. Instead I will gladly give her all the earth she wants, in return for all the earth she is. The sound of her heart beat and laughter, and all the time it takes to return to fall from the sky,down the hall, and right into love.God, I'd do it every day, if I could just land next to her.One small step for man, but she's one giant leap for my kind.

These are lines from my asteroid-impact novel, Regolith:Just because there are no laws against stupidity doesn’t mean it shouldn’t be punished.I haven’t faced rejection this brutal since I was single.He smelled trouble like a fart in the shower.If this was a kiss of gratitude, then she must have been very grateful. Not since Bush and Cheney have so few spent so much so fast for so long for so little.As a nympho for mind-fucks, Lisa took to politics like a pig to mud. She began paying men compliments as if she expected a receipt. Like the Aerosmith song, his get-up-and-go just got-up-and-went. “You couldn’t beat the crap out of a dirty diaper!”He embraced his only daughter as if she was deploying to Iraq.She was hotter than a Class 4 solar flare! If sex was a weapon, then Monique possessed WMDI haven’t felt this alive since I lost my virginity.He once read that 95% of women fake organism, and the rest are gay. Beauty may be in the eyes of the beholder, but ugly is universal. Why do wives fart, but not girlfriends? Adultery is sex that is wrong, but not necessarily bad. The dinosaurs stayed drugged out, drooling like Jonas Brothers fans. Silence filled the room like tear gas. The told him a fraction of the truth and hoped it would take just a fraction of the time. Happiness is the best cosmetic, He was a whale of a catch, and there were a lot of fish in the sea eager to nibble on his bait. Cheap hookers are less buck for the bang,Men cannot fall in love with women they don’t find attractive, and women cannot fall in love with men they do not respect.During sex, men want feedback while women expect mind-reading. Cooper looked like a cow about to be tipped over.His father warned him to never do anything he couldn’t justify on Oprah. The poor are not free -- they’re just not enslaved. Only those with money are free.Sperm wasn’t something he would choose on a menu, but it still tasted better than asparagus. The crater looked alive, like Godzilla was about to leap out and mess up Tokyo. Bush follows the Bible until it gets to Jesus. When Bush talks to God, it’s prayer; when God talks to Bush, it’s policy. Cheney called the new Miss America a traitor – apparently she wished for world peace. Cheney was so unpopular that Bush almost replaced him when running for re-election, changing his campaign slogan to, ‘Ain’t Got Dick.’ Bush fought a war on poverty – and the poor lost. Bush thinks we should strengthen the dollar by making it two-ply. Hurricane Katrina got rid of so many Democratic voters that Republicans have started calling her Kathleen Harris. America and Iraq fought a war and Iran won. Bush hasn’t choked this much since his last pretzel.Some wars are unpopular; the rest are victorious. So many conservatives hate the GOP that they are thinking of changing their name to the Dixie Chicks. If Saddam had any WMD, he would have used them when we invaded. If Bush had any brains, he would have used them when we invaded. It’s hard for Bush to win hearts and minds since he has neither. In Iraq, you are a coward if you leave and a fool if you stay. Bush believes it’s not a sin to kill Muslims since they are going to Hell anyway. And, with Bush’s help, soon. In Iraq, those who make their constitution subservient to their religion are called Muslims. In America they’re called Republicans. With great power comes great responsibility – unless you’re Republican.

Tell me something. Do you believe in God?'Snow darted an apprehensive glance in my direction. 'What? Who still believes nowadays?''It isn't that simple. I don't mean the traditional God of Earth religion. I'm no expert in the history of religions, and perhaps this is nothing new--do you happen to know if there was ever a belief in an...imperfect God?''What do you mean by imperfect?' Snow frowned. 'In a way all the gods of the old religions were imperfect, considered that their attributes were amplified human ones. The God of the Old Testament, for instance, required humble submission and sacrifices, and and was jealous of other gods. The Greek gods had fits of sulks and family quarrels, and they were just as imperfect as mortals...''No,' I interrupted. 'I'm not thinking of a god whose imperfection arises out of the candor of his human creators, but one whose imperfection represents his essential characteristic: a god limited in his omniscience and power, fallible, incapable of foreseeing the consequences of his acts, and creating things that lead to horror. He is a...sick god, whose ambitions exceed his powers and who does not realize it at first. A god who has created clocks, but not the time they measure. He has created systems or mechanisms that serves specific ends but have now overstepped and betrayed them. And he has created eternity, which was to have measured his power, and which measures his unending defeat.'Snow hesitated, but his attitude no longer showed any of the wary reserve of recent weeks:'There was Manicheanism...''Nothing at all to do with the principles of Good and Evil,' I broke in immediately. 'This god has no existence outside of matter. He would like to free himself from matter, but he cannot...'Snow pondered for a while:'I don't know of any religion that answers your description. That kind of religion has never been...necessary. If i understand you, and I'm afraid I do, what you have in mind is an evolving god, who develops in the course of time, grows, and keeps increasing in power while remaining aware of his powerlessness. For your god, the divine condition is a situation without a goal. And understanding that, he despairs. But isn't this despairing god of yours mankind, Kelvin? Is it man you are talking about, and that is a fallacy, not just philosophically but also mystically speaking.'I kept on:'No, it's nothing to do with man. man may correspond to my provisional definition from some point of view, but that is because the definition has a lot of gaps. Man does not create gods, in spite of appearances. The times, the age, impose them on him. Man can serve is age or rebel against it, but the target of his cooperation or rebellion comes to him from outside. If there was only a since human being in existence, he would apparently be able to attempt the experiment of creating his own goals in complete freedom--apparently, because a man not brought up among other human beings cannot become a man. And the being--the being I have in mind--cannot exist in the plural, you see? ...Perhaps he has already been born somewhere, in some corner of the galaxy, and soon he will have some childish enthusiasm that will set him putting out one star and lighting another. We will notice him after a while...''We already have,' Snow said sarcastically. 'Novas and supernovas. According to you they are candles on his altar.''If you're going to take what I say literally...'...Snow asked abruptly:'What gave you this idea of an imperfect god?''I don't know. It seems quite feasible to me. That is the only god I could imagine believing in, a god whose passion is not a redemption, who saves nothing, fulfills no purpose--a god who simply is.