Tag Archives: cosmos

Book Review: The Demon-Haunted World by Carl Sagan

The Demon Haunted World by Carl Sagan“Some portion of the decision making that influences the fate of our civilization is plainly in the hands of charlatans.” –Carl Sagan

Our world is rife with superstition, pseudo-science, theological fraud, sound bites and a decay of substantive content in the media, a celebration of ignorance and anti-intellectualism, and a disdain of true science (the latter three are especially true in the United States). In The Demon-Haunted World, Doctor Carl Sagan addresses these topics and much more, showing us the value of skepticism and scrutiny over mindless gullibility and immediate acceptance of statements from authority.

In each chapter, Sagan cites numerous incidents throughout history of when large swaths of society and entire nations were deceived by unquestioned superstition and false beliefs, dangerous political and social propaganda, the suppression of ideas and opposing views, and yes, even unethical scientists who apply their knowledge toward the detriment of humanity rather than its benefit.

Sagan also delves into cases of alien abductions, faith healing, telepathy, channeling spirits of the dead, and other “spurious” claims, even going so far as to include in the book correspondence from people throughout the country insisting on the existence of aliens, their visitations to Earth, their experimentations on, and in some cases impregnation of, unwitting victims, and their overall plans for humanity.

He does all of this without hubris or vanity, merely stating that science—when applied properly—allows us to maintain a skeptical mind toward outlandish assertions, to question the validity of dogmatic teachings, to interrogate the natural world for answers, and to perform experiments in search of facts rather believing whatever the authority du jour dictates as “fact.”

Sagan firmly believed that science and spirituality are not mutually exclusive and in fact, describes how and why each requires the other.]

Ultimately, as Sagan declared in his Cosmos television series and elsewhere, “Extraordinary claims require extraordinary evidence.” The Demon-Haunted World drives this point home eloquently and with great detail.

Book Review – Origins: Fourteen Billion Years of Cosmic Evolution by Neil deGrasse Tyson and Donald Goldsmith

Arguably the most popular science communicator since Carl Sagan, Neil deGrasse Tyson, in collaboration with fellow astrophysicist Donald Goldsmith, delivers an engaging and sometimes humorous account of the origins of the universe, our solar system, our planet, and life on Earth. I read Origins shortly after watching Tyson’s Inexplicable Universe series and reading A Universe from Nothing by Lawrence M. Krauss. As such, some of the material covered in the book (as well as a few of Tyson’s jokes) was review, such as the types and nature of quarks, the expansion of the universe as demonstrated by the Doppler effect (something I learned while watching the original Cosmos as the age of nine), the formation (and naming) of the planets, moons, and asteroids in our solar system (learned in middle school and high school), and a tour of periodic table (it’s been a while!).

I enjoyed the refresher on topics such as the anthropic principle, ekpyrotic theory of the universe, homogeneous versus isotropic models of the universe, classifications of galaxies and of nebulae, methods for discovering exoplanets (some of which were also demonstrated in episode seven of Carl Sagan’s Cosmos series. At least some things haven’t changed!), measuring a star’s age by its depletion of lithium, the three branches of the tree of life (bacteria, archaea, and eukaryota), and much more.

Highly recommended!

Book Review: Carl Sagan’s Pale Blue Dot

Carl Sagan - Pale Blue DotIn this sequel to the original Cosmos, Carl Sagan again reminds us of the intrinsic human desire to wander, and expands on many of the social and scientific topics discussed in the 1980 television series and accompanying book. Here, Sagan begins with primitive humans migrating across the planet for survival as much as to push the boundaries of a given frontier. From there, Sagan offers a personal anecdote, describing the hardships of his grandparents’ life in Eastern Europe and their fretful immigration to the United States.

A full chapter details the conflicts between science and religion in the early Catholic church and argues that the human race gained a measure of humility after reluctantly accepting the fact that we are not at the center of the universe.  As he did often in Cosmos, Sagan delves into the history of astronomical advancements including early discoveries of the larger moons around Jupiter, Saturn, and Uranus by Galileo, Huygens, Cassini, Kuiper, and Lassell as well as the naming (and renaming) of the first seven planets by the ancients—Earth, Moon, Mercury, Venus, Mars, Jupiter, Saturn—and how this inspired the development of the seven-day calendar week.

Readers are also treated to rich scientific detail about the planets and 60 plus natural satellites in our solar system based on data from the Viking, Galileo, Cassini-Huygens, Pioneers 10 and 11, and Voyager 1 and 2 probes. Further chapters delve into the atmospheric and surface compositions of the worlds, asteroids, and moons before Sagan goes on to expound three major threats to Earth’s environment—ozone depletion, global warming, and nuclear winter.

Sagan’s hopes and visions for the future of manned space exploration through international cooperation are inspiring for all their possibilities, but he is also pragmatic and laments the financial erosion and bureaucratic ossification of the space program over the past three decades and an unfortunate public shift in focus away from planetary exploration. However, in 1994, when Pale Blue Dot was published, it’s difficult to say whether Sagan predicted the dawn of private space agencies—such as SpaceX, Virgin Galactic, Blue Origin, and others—that would fill the void left by the government.

As always, Carl Sagan makes it clear that by exploring other worlds, we open our minds to possibilities far beyond the scope of our limited knowledge and experience bound up on this insignificant pale blue dot situated on the outer edge of a spiral arm lost among billions of stars and planets in the Milky Way.

We’re made of star stuff. We are a way for the cosmos to know itself.” – Carl Sagan, Cosmos.