Centauri Dreams continues to admire the clarity of the draft IAU resolution on the definition of a planet. Although the criteria are easily understood, they also present teaching opportunities (imagine all those schoolchildren learning what a barycenter is, and why Pluto/Charon make a double planet thanks to the location of their center of gravity!). This sound definition also grows from the properties of the planets themselves and is based on the best current information on planetary formation. Galileo Galilei had some thoughts on naming things that seem apropos, and what better source to consider when defining a planet? The Tuscan astronomer/mathematician (1564-1642) could have been speaking of the current controversy when he said, "Names and attributes must be accomodated to the essence of things, and not the essence to the names, for things come first and names afterward." I submit that the draft resolution does a fine job accomodating the named thing to its essence -- that...

It was Tennyson whose narrator, recalling youthful wanderings and celestial vistas in the poem 'Locksley Hall,' wrote about 'the fairy tales of science, and the long result of Time.' That long result is something we seldom look at in our feverish and accelerated world, but in these closing paragraphs from a book written with Chesley Bonestell in 1972, Arthur C. Clarke thinks about the Pioneer spacecraft, the distant future and the things that may survive man. For the Pioneers will keep going. "As our space-faring powers develop, we may overtake them with the vehicles of a later age and bring them back to our museums, as relics of the early days before men ventured beyond Mars. And if we do not find them, others may. "We should therefore build them well, for one day they may be the only evidence that the human race ever existed. All the works of man on his own world are ephemeral, seen from the viewpoint of geological time. The winds and rains which have destroyed mountains will make...

One summer night last year I found myself at a dinner party that had stretched late into the evening. Enjoying a good Côtes du Rhône and watching distant lightning flickering through the trees outside, I hadn't been saying much until the subject came around to space. Suddenly I was challenged to justify the notion of exploring not just distant stellar systems but even the nearby planets. And before long I was talking about the need to develop technologies that could help us deflect a potential life-threatening asteroid. At which point one of the guests stopped me cold by saying, "Why should we deflect it? The human race has done little enough. What does it matter if we're all destroyed?" Try to talk someone out of that. It's early 21st Century weltschmzerz in its purest form, writing off all future generations because of a perceived sense of human failure. Not even half a bottle of Côtes du Rhône could take the edge off it. Reading a recent essay in Acta Astronautica by Giancarlo...

Centauri Dreams' fascination with the history of science occasionally yields to forgetfulness. Which is why this piece on German mathematician and astronomer Friedrich Wilhelm Bessel, runs two days after his birthday rather than on the occasion itself. Bessel (July 22, 1784 - March 17, 1846) would go on to perform remarkable work in the study of stellar distances that in many respects anticipated the work of today's exoplanet hunters. He became, in fact, the first person to predict the existence of an unseen companion around another star. That was quite an accomplishment in 1844, when Bessel announced the find around Sirius, based on minute deviations in the motion of the star. The discovery would be verified by Alvan Graham Clark in 1862 with the first observations of Sirius B. We now know that Sirius B orbits the primary at a distance of roughly 20 AU, not so far off the 23.7 AU mean separation between Centauri A and B, although there the resemblance stops -- Sirius B is a white...

"The urge to explore, the quest of the part for the whole, has been the primary force in evolution since the first water creatures began to reconnoiter the land. We humans see this impulse as the drive to self-transcendence, the unfolding of self-awareness. The need to see the larger reality -- from the mountaintop, the moon, or the Archimedean points of science -- is the basic imperative of consciousness, the specialty of our species. If we insist that the human quest await the healing of every sore on the body politic, we condemn ourselves to stagnation. Living systems cannot remain static; they evolve or decline. They explore or expire. The inner experience of this imperative is curiosity and awe. The sense of wonder -- the need to find our place in the whole -- is not only the genesis of personal growth but the very mechanism of evolution, driving us to become more than we are. Exploration, evolution, and self-transcendence are but different perspectives on the same process." Wyn...

Stewart Brand is a leading proponent of long-term thinking, the sort of thing that builds cathedrals and, perhaps one day, starships. In this excerpt from his book The Clock of the Long Now (New York: Basic Books, 1999), Brand discusses science fiction and the various forms of futurism. According to Kevin Kelly, 'Isaac Asimov once said that science fiction was born when it became evident that our world was changing within our lifetimes, and therefore thinking abut the future became a matter of individual survival.' The nanotechnology futurist Eric Drexler concurs: 'I have found over the years that people familiar with the science fiction classics find it much easier to think about the future, coming technologies, political effects of those technologies, and so on.' At Global Business Network (GBN), the scenario-planning business that employs me, we frequently send out science fiction books to the Network membership, and when we can get writers such as William Gibson, Bruce Sterling,...

Centauri Dreams returns to its normal schedule on Monday, following a week devoted to the emergence of the Tau Zero Foundation. Next week will be a busy one, with a new and significant study of Proxima Centauri, a more detailed than ever look at the complicated happenings around Beta Pictoris, and a paper presenting a fast, beamed propulsion mission to Alpha Centauri serving as the highlights. Thanks to all who wrote asking for further information about the Tau Zero Foundation and its plans to support research practitioners in work that may one day lead to interstellar flight. I'll continue to follow Foundation news here as the group works towards the launch of its own Web site. It's heartening to see the spirit of exploration embraced by readers and advocated on the Net, as noted, for example, in this post on Brian Wang's Advanced Nanotechnology site. A snippet: If we had the will we would mount a D-Day scale invasion of space. The current space effort, as noble as it has been, was...

Going to the stars is a matter of hard science, but it's also a question of inspiration. I know scientists who found their calling by reading Poul Anderson's novel Tau Zero, and others whose love of the early Star Trek forever changed their career path. But for some of us, growing up in the 1950s, it was Tom Corbett, Space Cadet that did the trick, and for me, it was a book by Carey Rockwell called Danger in Deep Space (New York: Grosset & Dunlap, 1953). The second in the Tom Corbett series, the book exposed this space-crazy kid to a planet orbiting one of the Alpha Centauri stars, and before long the thought of habitable worlds around stars other than our own became an obsession. Which brings us to Frankie Thomas, who died recently of respiratory failure at the age of 85. A workmanlike actor who appeared in a number of pre-WWII films and Broadway plays, Thomas took up radio and television work after leaving military service and was cast as Tom Corbett in 1950 (beating out a young...

Centauri Dreams often uses planetary peril as one good reason for expansion into the universe. As the human species spreads out onto multiple worlds, the chances of survival continue to increase even if our planet meets catastrophe in the form of a rogue asteroid or comet. But another good reason is the need for exploration that seems to be hard-wired into our nature, in which case interstellar expansion becomes more or less inevitable if we can solve the technological riddles it involves. Do humans really have an innate drive for exploration, and if so, how does it operate? References for the notion are numerous, but a new study out of University College London gives a highly analytical look at what may be going on. Nathaniel Daw and John O'Doherty argue that pushing into the unknown involves a different part of the brain than staying on familiar territory. By analyzing how the brain works while people gamble, they show that what exploration demands is an overriding of the desire...

"Advanced societies throughout the galaxy probably are in contact with one another, such contact being one of their chief interests. They have already probed the life histories of the stars and other of nature's secrets. The only novelty left would be to delve into the experience of others. What are the novels? What are the art histories? What are the anthropological problems of those distant stars? This is the kind of material that these remote philosophers have been chewing over for a long time..." -- Philip Morrison (1961) "Will we be able to understand the science of another civilization?... Our science has concentrated on asking certain questions at the expense of others, although this is so woven into the fabric of our knowledge that we are generally unaware of it. In another world, the basic questions may have been asked differently." -- J. Robert Oppenheimer (1962)

The recently released NASA budget has researchers shaking their heads and Centauri Dreams readers writing to check on the status of some of the programs we've highlighted here. The news is indeed bleak -- at least temporarily so -- and what is particularly grating is the decision to cut numerous worthwhile projects in NASA's strongest areas while funding a whopping 17 additional Shuttle flights. That these moves are counterproductive should be obvious to anyone who has just lived through the years of Cassini, Huygens, Stardust, Spirit, Opportunity, Deep Impact... The list could go on. The success of the robotic exploration of the Solar System (now pushing into the interstellar regions beyond) has been outstanding, but in terms of public relations it seems dwarfed by a manned program that is now directed at entirely questionable goals. The fact that the egregiously out-of-date Space Shuttle continues to leach funds from proven robotic technologies makes the disparity all the more...

Science writer Larry Klaes wrote last November with a thought about New Horizons that I've been pondering ever since. Klaes was troubled to learn that the spacecraft -- just the fifth mission ever launched that will eventually leave the Solar System -- was carrying little that could communicate information about its makers. Its major relic was a CD disc with signatures collected from those who signed up at a Web site, along with an image of the mission team. Klaes added that the CD would itself would be rendered unreadable within decades or, at most, a few centuries. Noting that the European Space Agency had included samples of 1000 human languages on its Rosetta comet probe, Klaes went on to say, "I think this is why an independent committee should be formed working with NASA and any other space agency that plans to launch probes into interstellar space to create messages/info carriers for those future vessels. This may help to avoid giving the mission teams any extra issues beyond...