Why aren't they here? : the question of life on other worlds /

Are we alone? : scientists search for life in space /
by: Skurzynski, Gloria
Published: (2004)

We are not alone ; the search for intelligent life on other worlds.
by: Sullivan, Walter
Published: (1964)

We are not alone ; the search for intelligent life on other worlds.
by: Sullivan, Walter
Published: (1966)

We are not alone : why we have already found extraterrestrial life /
by: Schulze-Makuch, Dirk, 1964-
Published: (2010)

The search for life on other planets /
by: Jakosky, Bruce M.
Published: (1998)

Other worlds than ours /
by: Cade, C. Maxwell (Cecil Maxwell)
Published: (1967)

Aliens /
by: Hamilton, John, 1959-
Published: (2007)

Rare earth : why complex life is uncommon in the universe /
by: Ward, Peter D. (Peter Douglas), 1949-
Published: (2000)

Rare earth : why complex life is uncommon in the universe /
by: Ward, Peter D. (Peter Douglas), 1949-
Published: (2003)

Life on other worlds : the 20th-century extraterrestrial life debate /
by: Dick, Steven J.
Published: (1998)

Life beyond Earth : the search for habitable worlds in the Universe /
by: Coustenis, Athena
Published: (2013)

Five billion years of solitude : the search for life among the stars /
by: Billings, Lee
Published: (2013)

First contact : scientific breakthroughs in the hunt for life beyond Earth /
by: Kaufman, Marc
Published: (2011)

Understanding life in the universe /
by: Arthur, Wallace
Published: (2023)

Life beyond Earth : the intelligent Earthlings' guide to life in the universe /
by: Feinberg, Gerald, 1933-1992
Published: (1980)

The search for extraterrestrial life.

Man on another world /
by: Ehrensvärd, Gösta Carl Henrik, Greve, 1910-
Published: (1965)

The search for life on Mars : evolution of an idea /
by: Cooper, Henry S. F.
Published: (1980)

Alone but not lonely : exploring for extraterrestrial life /
by: Friedman, Louis
Published: (2023)

Cosmic company : the search for life in the universe /
by: Shostak, G. Seth
Published: (2003)

The quest : a report on extraterrestrial life /
by: Allen, Thomas B.
Published: (1965)

The Galactic Club : intelligent life in outer space /
by: Bracewell, Ronald N. (Ronald Newbold), 1921-2007

Lonely planets : the natural philosophy of alien life /
by: Grinspoon, David Harry
Published: (2003)

After contact : the human response to extraterrestrial life /
by: Harrison, Albert A.
Published: (1997)

The Galactic Club : intelligent life in outer space /
by: Bracewell, Ronald N. (Ronald Newbold), 1921-2007
Published: (1974)

The search for extraterrestrial intelligence : listening for life in the cosmos /
by: McDonough, Thomas R.
Published: (1987)

Who goes there? : The search for intelligent life in the universe /
by: Edelson, Edward, 1932-
Published: (1979)

Messages from the stars : communication and contact with extraterrestrial life /
by: Ridpath, Ian
Published: (1978)

On civilized stars : the search for intelligent life in outer space /
by: Baugher, Joseph F.
Published: (1985)

Captured by aliens : the search for life and truth in a very large universe /
by: Achenbach, Joel
Published: (1999)

The inner limits of outer space /
by: Baird, John C.
Published: (1987)

Strange new worlds : the search for alien planets and life beyond our solar system /
by: Jayawardhana, Ray
Published: (2011)

Looking for life in the universe : the search for extraterrestrial intelligence /
by: Jackson, Ellen, 1943-
Published: (2002)

Beyond Earth : the search for extraterrestrial life /
by: Gallant, Roy A.
Published: (1977)

Life in the universe /
Published: (1981)

What does a martian look like? /
by: Cohen, Jack S. (Jack Sidney), 1938-
Published: (2004)