“Absence of Extraterrestrials on Earth”

During June

1975

,

Michael Hart

’s paper entitled “An Explanation for the Absence of Extraterrestrials on Earth” was published by the Quarterly Journal of the Royal Astronomical Society.

Sections below

1. Web Resources

2. Book References

3. Other material

Web Resources

There is a rapid turnover of UFO material on the Internet. Many links to material on UFO websites quickly become out of date. Therefore, instead of giving many links to specific webpages I have instead focused on providing tables of references to discussion of UFO incidents, personalities and other matters in various books. Those tables of references to discussion in books can be sorted by author, length and date. I hope these tools are useful.

Book References

Complete text reprinted in “Extraterrestrials: Where are they?” (1982) (edited by Michael Hart and Ben Zuckerman) (available on Amazon USA and on Amazon UK) at pages 1-8 (in Chapter 1 generally) of the Cambridge softcover second edition.

Complete text of article reprinted in “The Quest For Extraterrestrial Life: A Book of Readings” (1980) (edited by Donald Goldsmith) (available on Amazon USA and on Amazon UK) at pages 228-231 (in Chapter 42) of the University Science Books hardback edition.

The table below includes references to relevant discussions in UFO/SETI books noted by Isaac Koi during a review of approximately 963 UFO/SETI books during the period 2003-2006 (with a few later additions). The table can be sorted by author, date and length of discussion by clicking on the relevant word in the top line of the table.

Many of the tables of references on this website are considerably longer than the references to books found on most other UFO websites. Indeed, some are probably the longest that have been collated in relation to some events and personalities. I hope that these tables are found to be a useful contribution to UFOlogy.

For discussion of Hart’s paper see the following:

Year	Discussion by:	No. of Pages
1999	Achenbach, Joel in his “Captured by Aliens” (1999) (available on Amazon USA and on Amazon UK) at pages 65-66 (in Chapter 6) of the Simon and Schuster hardback edition.	2
1976	Cox, Laurence in “The Quest For Extraterrestrial Life : A Book of Readings” (1980) (edited by Donald Goldsmith) (available on Amazon USA and on Amazon UK) at pages 232-235 (in Chapter 43) of the University Science Books hardback edition. The relevant chapter is a reprint of “An Explanation for the Absence of Extraterrestrials on Earth”, Quarterly Journal of the Royal Astronomical Society, volume 17, pages 201ff (1976).	4
1999	Davidson, Keay in his “Carl Sagan: A Life” (1999) (available on Amazon USA and on Amazon UK) at page 346 (in Chapter 14) of the Wiley softcover edition.	1
1991	Drake, Frank and Dava Sobel in their “Is Anyone Out There?“ (1991) (available on Amazon USA and on Amazon UK) at pages 202-204 (in Chapter 9) of the Pocket Books paperback edition.	3
1977	Schwartzman, David W in “The Quest For Extraterrestrial Life : A Book of Readings” (1980) (edited by Donald Goldsmith) (available on Amazon USA and on Amazon UK) at pages 264-265 (in Chapter 51) of the University Science Books hardback edition. The relevant chapter is a reprint of “The Absence of Extraterrestrials on Earth and the Prospects for CETI” in Icarus, Volume 23 (1977), pages 473ff.	2

Other Material

Hart, Michael “An Explanation for the Absence of Extraterrestrials on Earth”, in the Quarterly Journal of the Royal Astronomical Society, volume 16, pages 128-135 (1975).

Please use the comments section below to share references to any particularly interesting relevant articles.