Автор: Professor Seth Shostak
Год выпуска: 2002
Тип раздаваемого материала: Видеоурок
Продолжительность: 12 лекций по 30 мин.
Что такое жизнь? Результат игры разума или статистически незначимая случайность? Несмотря на научный прогресс 20-го века и открывшиеся технические возможности, человечество так и не приблизилось к ответу. Американский профессор, выпускник Принстонского университета и Калифорнийского технологического института, Сэт Шостэк пытается найти свой ответ на извечный вопрос: одиноки ли мы во Вселенной?
Is it possible that somewhere in the myriad starfields of the universe, other intelligences as sophisticated as our own exist?
For thousands of years, humankind could only wonder. But science and technology now offer us the opportunity to conduct a search for such cosmic company. For the first time, we can actually hope to answer questions that previous generations could only ask:
* In a universe so vast, can we really be alone?
* Is the life we have often thought of as a miracle simply a statistic?
* If others are out there, are they also thinking about us?
* Will we encounter them someday?
* What will it mean if and when we do?
Have you ever stopped to really consider the implications?
"At the very least," says Dr. Seth Shostak, "we should be prepared for the simple fact of finally knowing that we're not alone."
As the third millennium begins, humankind has finally achieved the technical means to address a question that is both old and profound: are we alone in the universe? Despite the fact that alien beings regularly infest movies and television shows, there is still no compelling evidence for any living creatures beyond Earth. But there are highly suggestive reasons to believe that the star fields of the cosmos are teeming with life, some of it intelligent. In this series of twelve lectures, we consider what science can tell us about the possibility of intelligent life in space, how we might find it, and what it would mean if we did.
The First two lectures set the stage in our quest for cosmic company. One of the principal achievements of as in the last four centuries has been to show that our physical pine in the universe is anything but special. The glow of ten thousand billion billion stars lies within the purview of our telescopes, and one in ten is similar to our Sun. We occupy only a tiny speck of real estate in a massive, expanding universe that was brought into being approximately twelve billion years ago. Our own solar system is relatively new, being only one-third the age of the oldest stars, and consequently what has happened here — the emergence of biology and technically sophisticated life — may have happened billions of years earlier elsewhere. Even in the eighteenth century, when we had little knowledge of the universe’s vast extent, the possibility that nearby planets might house sentient beings was considered. Mars, in particular, a century ago was posited to be the home of an advanced society busy lacing the landscape with a network of canals.
Lectures Three and Four are devoted to the modern attempts to locate nearby life as well as habitable worlds beyond the Sun’s familiar retinue of planets. In 1996, a meteorite kicked off the surface of Mars was retrieved and analyzed by NASA and university scientists. Evidence was pried from this rock implying that simple life existed on the Red Planet more than three billion years ago. Other worlds in our solar system, the moons Europa and Titan, may sport living creatures even today. While the abodes for life in our “back yard” tempt NASA scientists, astronomers looking farther afield have discovered that more than a dozen sun-like stars within a few dozen light-years show tell-tale evidence of having their own planets. These developments, the product of recent research, suggest that life is not a miracle, but merely a statistic, thus prompting intensive efforts to seek out other intelligence.
Lectures Five through Seven consider the consequences of interstellar travel. While a staple of science fiction, sending rockets from one star system to another is considerably beyond our own technical capabilities. Some scientists maintain that it will be impractical even for advanced societies. However, if one admits the possibility that blasting off to the stars might could occur, what consequences might that hold for us? In 1950 physicist Enrico Fermi realized that easy space travel would lead to rapid colonization of the galaxy. Since there is no obvious evidence that such colonization has occurred. Fermi asked “where is everybody?” Lecture Six deals with the ingenious answers that have been proposed to address this famous question while the following lecture eon side the possibility (favored by many among the public) that the aliens are, in fact buzzing Earth with their saucers.
Construction and behavior. Carbon-based life has a firm foothold on our planet.. but is that a mere accident of an history? Silicon-based biology is a favorite with sci-fi authors, but under most circumstances will take a back seat to carbon. On the other hand silicon-based intelligence might not. Could it he that most nil the intelligence in the universe is non-biological? And what might motivate aliens to get in touch either with a radio broadcast or in person? Lectures Ten through Twelve deal with the modem efforts to find intelligent societies by attempting to eavesdrop on their broadcasts. In 1959 two physic’ at Cornell made simple calculations that showed, somewhat to their surprise, sending radio messages between the stars was both simple and inexpensive. universe might be flooded with radio traffic. Since 1960, when the first search for alien signals was conducted by Dr. Frank Drake, radio telescopes of increasing capability have been turned on the cosmos in the hope of finding a faint signal that would betray the presence of another civilization. While these efforts have yet to succeed, those who are engaged in the Search for Extraterrestrial intelligence, or SETI, don’t hesitate to speculate that a signal could be found early in the 21″ century. Should this occur, what would be the
impact on human society? Our course concludes with thoughts about the consequences of finding proof of other intelligence. far beyond the banal of our own world. Perhaps we should anticipate being inducted into a galactic club or perhaps a truly universal church. At the very least we should be prepared for the simple fact of finally knowing that we’re not alone.
01. Our place in the Cosmos
02. Aliens in the neighborhood - fiction and fact
03. Prospects for life in the solar system - Mars, Europa, Titan
04. Other Worlds - The search for habitable planets
05. Interstellar travel and colonization
06. Why aren't the Aliens everywhere
07. Why UFOs are bunk
08. What is ET made of
09. Alien appearance and motivation - Can science tell us anything
10. Searching for ET - Modern techniques
11. Estimating the number of civilizations - The Drake Equation
12. If we find ET - What then
Видео кодек: DivX
Аудио кодек: MP3
Видео: 640x480 29.97fps 675Kbps
Аудио: 48kHz stereo 128Kbps
Out of print.