ASTR 121 (O'Connell) Study Guide 18



Because it fixes the ultimate scope of the human universe by exploring the largest scales of space and time, astronomy has always had a strong hold on the imagination. Inevitably, discoveries about stars and planets raise questions about life on other worlds.

Speculation about inhabitants of other planets goes almost as far back in history as there are written records, but it was given new impetus after 1610 by the enormous Copernican/Galilean universe: potentially infinite in extent and filled with planets like the Earth.

Until the end of the 19th century, aliens were usually imagined to be benevolent creatures. Since then, the popular picture of aliens has darkened considerably. As the movie poster above vividly testifies, they are now typically viewed as menacing (the Steven Spielberg cutie-pie creatures of "ET" and "CE3K" notwithstanding).

The change can be traced to a single novel, stimulated in turn by astronomers' studies of the planet Mars. This lecture discusses the novel and one of its main legacies: a remarkably widespread form of mild mass hysteria, the "UFO" phenomenon.


Martians rule in "War of the Worlds"


A. THE WAR OF THE WORLDS

Claims of some astronomers (1875+) about Martian "canals" and Percival Lowell's widely circulated arguments that these were artificial and imply civilizations on Mars provoked intense public interest in extraterrestrial life. (Lowell's popular impact was much larger than his scientific impact.)

Intrigued by the notion of life on Mars, H.G. Wells wrote The War of the Worlds (1898)


David notices something's wrong in the backyard in "Invaders from Mars," a classic 1950's paranoid fantasy in which his parents and most other adults are taken over by the invaders, except for a dashing astronomer and a beautiful doctor, who help David save the world---or do they?

B. UFO'S

One lasting legacy of Lowell, Wells, and a vast amount of speculation by others is the "UFO" controversy. What started as a legitimate (if misguided) interpretation of astronomical observations and a brilliant piece of fiction has become a worldwide mini-industry, with a multitude of committed believers and its own media and interest groups. It is based on the belief that the Earth is under continuous surveillance by alien spacecraft and that there is a government conspiracy to cover this up.

UFO = "Unidentified Flying Object"

Anomalistic Phenomena:

UFO's are an example of an anomalistic phenomenon: something apparently inconsistent with the prevailing scientific consensus but only marginally documented.

Our scientific understanding of many aspects of the natural world is truly profound, as it should be after hundreds of years of concentrated effort. If our fundamental assumptions about the physical or biological world were seriously wrong, then (as discussed in Study Guide 9) much of the technology we use in everyday life would simply not work. For instance, our deep understanding of electromagnetism is tested billions of times each second in electronic circuits around the world.

There are strong incentives for scientists to discover new phenomena or interpretations that countervail the accepted wisdom. That is how young people make careers in science. However, there is always the obligation to demonstrate, usually by very hard work, the validity of new views to a (properly) skeptical audience.

In contrast to the subjects of mainstream science, "anomalistic" phenomena are not even established as real. There is insufficient objective, controlled evidence to show that the claimed phenomena even exist, let alone imply something beyond the capacity of normal science to explain. There is much more wishful thinking than hard thinking about such topics.

Long history of "strange things" in the sky:

Scientific standards

Scientific assessment of UFO reports

Conclusions:




Reading for this lecture: Reading for next lecture: Web links:

Extraordinary Popular Delusions and the Madness of Crowds Charles Mackay (1841).

As of April 2009, you can find upwards of 50 million pages(!) on the Web that discuss UFO's (up by 14x in 5 years). The vast majority of these will feature uncritical acceptance of the ET hypothesis. Some antidotes:


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Last modified April 2009 by rwo

Artwork here is from War of the Worlds, The Musical and original film posters & promo material. Scan of the cover of the 1993 edition of WoW from Dr. Zeus. Text copyright © 1998-2009 Robert W. O'Connell. All rights reserved. These notes are intended for the private, noncommercial use of students enrolled in Astronomy 121 at the University of Virginia.