''Billions and Billions: Thoughts on Life and Death at the Brink of the Millennium'' is a 1997 book by the American astronomer and science popularizer Carl Sagan. The last book written by Sagan before his death in 1996, it was published by

Random House Random House is an American book publisher and the largest general-interest paperback publisher in the world. The company has several independently managed subsidiaries around the world. It is part of Penguin Random House, which is owned by Germ ...

Overview

The book is a collection of essays Sagan wrote covering diverse topics such as

global warming In common usage, climate change describes global warming—the ongoing increase in global average temperature—and its effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to E ...

, the

population explosion Overpopulation or overabundance is a phenomenon in which a species' population becomes larger than the carrying capacity of its environment. This may be caused by increased birth rates, lowered mortality rates, reduced predation or large scale m ...

, extraterrestrial life,

morality Morality () is the differentiation of intentions, decisions and actions between those that are distinguished as proper (right) and those that are improper (wrong). Morality can be a body of standards or principles derived from a code of co ...

, and the

abortion debate The abortion debate is a longstanding, ongoing controversy that touches on the moral, legal, medical, and religious aspects of induced abortion. In English-speaking countries, the debate most visibly polarizes around adherents of the self-describ ...

. The last chapter is an account of his struggle with myelodysplasia, the disease which finally took his life in December 1996. Sagan's wife, Ann Druyan, wrote the epilogue of the book after his death.

"Billions and billions"

To help viewers of ''

Cosmos The cosmos (, ) is another name for the Universe. Using the word ''cosmos'' implies viewing the universe as a complex and orderly system or entity. The cosmos, and understandings of the reasons for its existence and significance, are studied in ...

'' distinguish between "millions" and "billions", Sagan stressed the "b". Sagan never did, however, say " billions and billions". The public's association of the phrase and Sagan came from a ''

Tonight Show ''The Tonight Show'' is an American late-night talk show that has aired on NBC since 1954. The show has been hosted by six comedians: Steve Allen (1954–1957), Jack Paar (1957–1962), Johnny Carson (1962–1992), Jay Leno (1992–2009 and 2010� ...

'' skit. Parodying Sagan's affect, Johnny Carson quipped "billions and billions".Carl Sagan takes questions more from his 'Wonder and Skepticism' CSICOP 1994 keynote, Skeptical Inquirer
The phrase has, however, now become a humorous fictitious unit—the sagan. Aside from using the catchphrase as the title of the book, Sagan's introduction also discusses it.

References

External links

A review
of the book
Video of skit
from ''

The Tonight Show Starring Johnny Carson ''The Tonight Show Starring Johnny Carson'' was an American late-night talk show hosted by Johnny Carson on NBC, the third iteration of the ''Tonight Show'' franchise. The show debuted on October 1, 1962, and aired its final episode on May 22, ...

'' mentioning "billions and billions" {{Carl Sagan 1997 non-fiction books American non-fiction books Books published posthumously English-language books Random House books Popular physics books Works by Carl Sagan