'Alternative biology' is the study of theoretical or non-traditional life forms such as
acellular life,
non-carbon-based life,
extraterrestrial life,
cyborg life, or
artificial life.
It also considers the earliest theoretical forms of life on Earth, such as
RNA life or
Iron-sulfur life which may have been the
earliest organisms.
Known biological entities which may not always be considered life may also be considered in alternative biology such as
viruses and
plasmids.
See also
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Alternative biochemistry
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Artificial life
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Astrobiology
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Biorobotics
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Cyborg
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Extraterrestrial life
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Non-cellular life
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Self-replicating machine
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Synthetic biology
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Synthetic life