

Remembering Carl Sagan & his contributions to humanity




You can read the whole article, for free, here.In March of 2008, I sat down in the carriage house with Friedman and two other members of his solar-sailing team: Harris “Bud” Schurmeier, the retired project manager on the old Voyager missions; and Viktor Kerzhanovich, whose long career in both Russia and America has earned him the U.S.S.R. State Prize and more than one NASA Group Achievement Award. If the Planetary Society tends to exhort its more than 50,000 members in sonorous terms, conversation in the carriage house was speculative and playful. Throughout the morning, the years fell away from the three old-timers eager to tell a visitor about how solar sailing works—and to spar a bit.
“Light has energy,” said Friedman. “That you can’t argue with.”
“More important,” said Kerzhanovich, “it has momentum.”
“Therefore it has a force,” added Friedman. “You’re using the energy of light, and the force derived thereof, to transfer momentum of light energy to your vehicle, in order to propel the spacecraft. Basically your spacecraft, your solar sail, looks like a sail, but it really is a mirror. And so it’s reflecting the light, and that reflection is where the momentum transfer occurs.” If the mirror were fixed to a wall, there would be no transfer. But in free space, with no gravity and no air pressure? You’re off to the cosmic races.
“It’s not the solar wind,” Friedman reminded me.
“Things got named wrong,” said Schurmeier. However pretty it sounds, “sailing” is really a metaphor. There is such a thing as solar wind, but as Friedman explained, “Solar wind is electrons and protons that come from the sun, and they have mass, but they go very much slower than light.”
It’s photons, not protons, that we’re talking about?
“Right,” said Friedman. “Photons have no mass, they’re all energy. You do get a force from the solar wind, but it’s about a thousand times less than the force you get from this reflection. You turn your mirror in different directions, you can point the force in any direction you want!”
In 1980, the landmark series Cosmos premiered on public television. Since then, it is estimated that more than a billion people around the planet have seen it. Cosmos chronicles the evolution of the planet and efforts to find our place in the universe. Each of the 13 episodes focuses on a specific aspect of the nature of life, consciousness, the universe and time. Topics include the origin of life on Earth (and perhaps elsewhere), the nature of consciousness, and the birth and death of stars. When it first aired, the series catapulted creator and host Carl Sagan to the status of pop culture icon and opened countless minds to the power of science and the possibility of life on other worlds.The version of the series used seems to be the same as the 2000 DVD version; it's especially nice to have Ann Druyan's introduction at the beginning of the first episode, as well as the 1990 updates at the end of episodes like The Edge of Forever. (I'm guessing that the DVD music changes are still in there.) And unfortunately, the website is restricted to viewers in the United States.
In the years before cable television fragmented Americans into ever smaller viewership groups, both men took advantage of the broadcast television networks to communicate directly to a mass audience. Reagan would make speeches during prime time from the Oval Office such as his 1983 call to scientists to develop the Strategic Defense Initiative. "I call upon the scientific community in our country, those who gave us nuclear weapons, to turn their great talents now to the cause of mankind and world peace, to give us the means of rendering these nuclear weapons impotent and obsolete," declared Reagan.Follow through to the original post for video.
And before The Daily Show or The Colbert Report turned late night comedy into platforms for scientists such as Neil deGrasse Tyson, Sagan would appear as a regular on Johnny Carson reaching tens of millions of viewers. The astronomer was so familiar to American audiences that Carson would even affectionately impersonate Sagan in skits.

We have searched the skies for signals. Our spacecraft have explored dozens of exquisite worlds in the family of our sun. But as far as we've looked, there's only one place in the entire universe where the miracle of life exists: our own planet Earth. Life is so rare and precious. We must safeguard, protect, and cherish it.Sagan is also one of the scientific advisors listed in the credits.

"Carl's and my dream was to write something that would be a fictional representation of what contact would be like," explains Ann Druyan, Sagan's wife and collaborator. "But it would also have the tension inherent between religion and science, which was an area of philosophical and intellectual interest that riveted both of us."Each night's worth of movies is organized by a specific decade (all the way from the 1920s to the 1990s and 2000s); it so happens that immediately before Contact on the schedule is a somewhat different 1997 alien contact science fiction film, Men in Black. Saganites have mixed opinions on the merits of MIB; Keay Davidson in his biography of Sagan dismisses it as a dumbed-down "mean-spirited bloodbath"; whereas pop-culture-savvy Nick Sagan slipped in an homage (or more precisely, an homage to an homage) to it in his short story "Tees and Sympathy":
I thought that was clear. The reason why I’m wearing a black suit and sunglasses is because I’m homaging Men in Black.And Phil Plait answers the question of how "a skeptical, UFO-bashing, aliens-aren't-visiting-us-and-excoriating-cow- you-know-whats scientist-type guy" can enjoy the film in his review:
I loved this movie.Surprised? "What's a skeptical, UFO-bashing, aliens- aren't-visiting-us-and-excoriating-cow-you-know-whats scientist-type guy going around saying he loves a movie whose very premise is that not only do aliens exist, but live among us?" you are asking yourself.
Well, the movie is awesome. It rocks. I laughed all the way through it. It's funny. It's also satirical, poking gentle but firm fun at the whole UFO and alien subculture.
(Also, for all the differences in tone, note that both films use a shot consisting of an extended zoom out from Earth to outer space to comment on humanity's place in the universe.)
If you're wondering why you never heard of a spinoff of Cosmos based on Carl Sagan and Ann Druyan's book of the same name, it's because the film in question — a 1964 Soviet film by Sergei Parajanov — was instead the source for the name of the Sagan/Druyan book! (Also, the film is not a documentary as one might expect, but fiction.) This seems to be the first North American region DVD release. Some links to stuff about the film:
Later this month, on December 20, 2007, we will reach the eleventh anniversary of Carl Sagan's passing — and the first anniversary of the wildly successful first-ever Carl Sagan Memorial Blog-a-Thon. Far exceeding my wildest expectations, this became a truly worldwide celebration, with more than 250 posts in 11 languages. And for those who like nice round anniversary numbers, this year also saw quite a number of significant Sagan-related ones: the tenth anniversary of the release of the film Contact and the Planet Walk in Ithaca, NY; and the thirtieth anniversary of the launch of the two Voyager spacecraft. I am launching a new blog-a-thon exactly a year after the first one; for full details, see the main announcement post on my personal blog. See you on the 20th!



Religion and science do not have to be at odds. Science, said Ann Druyan, widow of Cornell astronomer Carl Sagan, can communicate with, learn from and even benefit from religion and vice versa.Click here to read the whole article from Cornell University's Chronicle Online.Druyan, a writer and media producer who collaborated with Sagan for 19 years until his death in 1996, reflected on dialogues in the early 1990s between Sagan and the Dalai Lama at a Sept. 28 lecture in Anabel Taylor Auditorium. For the first time, film excerpts of the meeting between the two were shown in a public venue.
Sagan, Cornell professor and author of "Cosmos," "Contact" and "Dragons of Eden," among other books, was perhaps best known for his extraordinary ability to communicate science to the public. "He wanted to share with everyone the wonder and awe that science inspired in him," Druyan said.
She stressed that there were political motivations behind Sagan's work as well: "Carl believed that you can't have a democratic society if you have a tiny scientific elite and a public who is uncomfortable with the methods and language of science," she said.
The Galaxy Garden is a 100-foot diameter outdoor scale model of the Milky Way, mapped in living plants and flowers and based on current astrophysical data.
Artist Jon Lomberg conceived and designed the garden to encourage scientific education about our place in the Universe.
While strolling along The Philosopher's Path (left) from Ginkaku-ji in northeast Kyoto this summer, my fiancé and I passed this little coffee shop, Café de Sagan. Of course we were drawn to the name, but it's location on a beautiful stone path that borders a canal known as the Walk of Philosophy made its appearance serendipitous indeed. We stopped in for tea and coffee. Inside ambient music reminiscent of the Cosmos soundtrack drifted toward the front from speakers in back, no kidding. We asked the woman serving us about the name, and with her limited English and my fiancé's limited Japanese we gathered that the two characters (seen below) are pronounced say-gun, roughly translating as "We hope you come again." A chance discovery with some karmic undertones. A lovely spot. And good, strong coffee. Been meaning to share. 
Carl Sagan, an assistant professor of astronomy at Harvard, and Paul Swan, Senior Project Scientist at Avco Corporation, published results of their study of possible Voyager Mars landing sites in the January-February 1965 issue of the Journal of Spacecraft and Rockets. For their study, they invoked a Voyager design Avco had developed in 1963 on contract to NASA Headquarters. The "split-payload" design comprised an orbiter "bus" and a landing capsule. They would leave Earth together on a Saturn IB rocket with an "S-VI" upper stage.
The Voyager lander would be sterilized to prevent biological contamination of Mars. Near Mars it would separate from the orbiter, enter the martian atmosphere, and float to the surface on a parachute. It would operate on Mars for 180 days. The Voyager orbiter, meanwhile, would fire rockets to slow down and enter martian polar orbit, where it would photograph the surface and serve as a radio relay for the lander.

Voyager project manager John Casani displays the "Sounds of Earth" recording shortly before launch in 1977. The 12-inch gold-plated copper phonograph record was intended to serve as a time capsule that could communicate the story of Earth to extraterrestrials.
A NASA committee, chaired by renowned physicist Carl Sagan, assembled 115 images and a variety of natural sounds made by surf, wind, thunder, birds, whales and other animals. They also embedded musical selections from different cultures and eras, and spoken greetings in 55 languages. Encased in protective aluminum jackets, each record had its own cartridge and a needle. Instructions written in symbols explained the origin of the spacecraft and indicate how the record was to be played

Famed astronomer Carl Sagan served as a spokesman for the Voyager spacecraft. Here, Sagan discusses the Voyager 2 in the Jet Propulsion Labs in Pasadena, California on January 18th, 1986.
Forty thousand years will elapse before Voyager 1, departing the realm of the Sun at a speed of 38,000 miles per hour, passes anywhere near another star. (It will drift within 1.7 light years of a dim bulb called AC+79 3888.) And 358,000 years will elapse before Voyager 2 approaches the bright star Sirius.
Out there, our concepts of velocity become provincial. The stars are moving, too, in gigantic orbits around the center of the Milky Way galaxy. Voyager, a toy boat on this dark sea, will not so much approach Sirius as watch it sail by, bobbing in its mighty wake.
Contemplation of Voyager’s billion-year future among the stars may make us feel small and the span of our history seem insignificant. Yet the very existence of the two spacecraft and the gold records they carry suggests that there is something in the human spirit able to confront vast sweeps of space and time that we can only dimly comprehend.
It would be an opportunity for an uninhibited Sagan fellowship, a celebration of the man in the small city he called home. It would be a good opportunity to remind people of Sagan's continuing impact as well as a lighthearted way to put a public face on secularism, humanism, evolution, freethought, critical thinking, ethical science, skepticism, and yes, non-theism.Again, email Pat ASAP at SaganGathering@yahoo.com if you're interested in celebrating Sagan at this summer's Ithaca Festival.
A friend sent me a link to your site. I saw the photo of SmW's son, Sagan, posted on Feb 14. Our son is named Sagan too!
Just 40 years after a famous TIME magazine cover asked "Is God Dead?" the answer appears to be a resounding "No!" According to a survey by the Pew Forum on Religion & Public Life in a recent issue of Foreign Policy magazine, "God is Winning". Religions are increasingly a geopolitical force to be reckoned with. Fundamentalist movements - some violent in the extreme - are growing. Science and religion are at odds in the classrooms and courtrooms. And a return to religious values is widely touted as an antidote to the alleged decline in public morality. After two centuries, could this be twilight for the Enlightenment project and the beginning of a new age of unreason? Will faith and dogma trump rational inquiry, or will it be possible to reconcile religious and scientific worldviews? Can evolutionary biology, anthropology and neuroscience help us to better understand how we construct beliefs, and experience empathy, fear and awe? Can science help us create a new rational narrative as poetic and powerful as those that have traditionally sustained societies? Can we treat religion as a natural phenomenon? Can we be good without God? And if not God, then what?
This is a critical moment in the human situation, and The Science Network in association with the Crick-Jacobs Center brought together an extraordinary group of scientists and philosophers to explore answers to these questions. The conversation took place at the Salk Institute, La Jolla, CA from November 5-7, 2006.
When I was a young teen in 1980 there were three televisions in the house: One was in the small family room, and was typically shared by my parents. Another was in their bedroom - used primarily by my father to watch Kansas City Chiefs football games on crisp fall weekends. In my own inner sanctum - my bedroom, I had a little 13-inch GE black-and-white set, which I mostly used for watching PBS and Star Trek. It was on my little television that I learned about the coming premiere of Carl Sagan’s Cosmos.
Cosmos so intrigued me that I was motivated to leave the electronics and Lego and book-strewn confines of my own bedroom in search of a color television. I knew I needed to see stars and galaxies, nebulae and molecules in vivid color. I persuaded my parents to let me use their bedroom color television to watch the series, no small task given their dubious view of science-fiction, their abhorrence of evolution and general mystification regarding science. I eventually won the argument with assurances of the series’ educational value and reassurance of “non-sinful” content. Every week, I’d find myself plopped on my parents white king-sized comforter, propped-chin-in-hands, waiting for the next astonishing (my favorite Cosmos word) installment to propel my mind far from my pedestrian Ozarks home.

In medieval times, some people kept a human skull in their home to remind themselves of mortality, and to view their priorities against the big picture of life and death. A modern equivalent is the dinosaur fossil. The fossilized remains of a once great and dominant species reminds the human species of our eventual choice: survival or extinction, or as Sagan put it, “spaceflight or extinction”.It's a quick and interesting read and a great launch point for discussing our future in space. Thanks, Alex.
Thank you for a wonderful site.
I would be honored if you would watch, and possibly include, my recent video about Dr. Sagan. It is hosted at YouTube and Google video.

He had a knack for pinball, knowing just how hard to bump a machine without tilting it. We'd go to arcades together and he'd win bonus games like mad. Videogames were never his thing, though he could appreciate the better ones. I remember the day I showed him Computer Baseball, a strategy game for the Apple IIe. You could pit some of the greatest teams in MLB history against each other. We played Babe Ruth's 1927 Yankees against Jackie Robinson's 1955 Dodgers for about an hour, and then he turned to me and said, "Never show this to me again. I like it too much, and I don't want to lose time. Link.
I stupidly forgot to mention where the show is broadcast, it on London's Resonance 104.4FM, which as you have probably guessed, is broadcast on FM to the London area. Luckily though, its also broadcast worldwide at www.resonancefm.com.
We've been 10 times around the sun without him.nick sagan, joel's humanistic blog, axinar's, simple tricks and nonsense, esoteric science resource center, baby boomer librian, sciencebase, kat minnaar, too many tribbles, friendly atheist, beanmine, pinstripe bindi, azule banana, unscrewing the inscrutable, michael honey, clunkyrobot