1) Astrobiology 2) Biological science 3) Biology 4) Space biology 1) Astrobiology 
study of extraterrestrial life
A term introduced in 1960 by Joshua Lederberg 'to distinguish this aspect of space biology – the evolution of life beyond our own planet.' It is synonymous with astrobiology and bioastronomy.
The interdisciplinary science that studies evolutionary biology, including the origin and evolution of the major elements required for life, their processing in the interstellar medium and in protostellar systems. This field also includes the study of chemical evolution and the subsequent interactions between evolving biota and planetary evolution ...
The study of life outside the Earth.
The study of life outside the Earth.
Study of possibility of life in space.
[n] - the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life
exobiology A branch of biology with a special interest in the search for life on other planets and elesewhere in the universe, and with the study of conditions that might give rise to extraterrestrial life, as well as the study of the effects of extraterrestrial environments.
The study of biological processes that have or could have evolved away from the Earth. 
space biology noun the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life
the study of life beyond the earth's atmosphere, as on other planets. Also called