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Extraterrestrial life
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Extraterrestrial life
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Extraterrestrial life is life that is not from the planet Earth. It is alien life. It is reasonable that planets rather like ours exist, and that life might evolve there also. So far none has been found, though it is possible that life once existed on Mars.[1]
Searches have been made for signals from extraterrestrial life-forms.[2] No signals have been received.
It is not a new idea. Quite a few philosophers have speculated on the existence of other planets like ours, with the idea that what happened here could also happen there.[3][4] One thing we do know is that many other star systems do have exoplanets.
Related pages |
- Astrobiology
References |
↑ Sagan, Carl & Shklovskii I.S. 1966. Intelligent life in the Universe. Random House.
↑ Sagan, Carl 1973. Communication with extraterrestrial intelligence. MIT Press. .mw-parser-output cite.citationfont-style:inherit.mw-parser-output .citation qquotes:"""""""'""'".mw-parser-output .citation .cs1-lock-free abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .citation .cs1-lock-subscription abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registrationcolor:#555.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration spanborder-bottom:1px dotted;cursor:help.mw-parser-output .cs1-ws-icon abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center.mw-parser-output code.cs1-codecolor:inherit;background:inherit;border:inherit;padding:inherit.mw-parser-output .cs1-hidden-errordisplay:none;font-size:100%.mw-parser-output .cs1-visible-errorfont-size:100%.mw-parser-output .cs1-maintdisplay:none;color:#33aa33;margin-left:0.3em.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-formatfont-size:95%.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-leftpadding-left:0.2em.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-rightpadding-right:0.2em
ISBN 0-262-19106-7
↑ Crowe, Michael J. 1986. The Extraterrestrial life debate, 1750–1900. Cambridge.
ISBN 0-521-26305-0
↑ Crowe, Michael J. 2008. The extraterrestrial life debate Antiquity to 1915: a source book. University of Notre Dame Press.
ISBN 0-268-02368-9
Other websites |
Actual Aliens: Extraterrestrial News and Current Events
PBS: Exploring Space - The Quest for Life by Scott Pearson
ufoskeptic.org by Bernard Haisch
"What Aliens Might Look Like" from National Geographic- Top stars picked in alien search
Category:
- Extraterrestrial life
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