Is there life on Mars? Why the question still eludes us after years of

discovery | The Verge
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Source: www.theverge.com/2013/3/14/4100578/life-on-mars-still-elusive-after-curiosity-viking-other-discoveries


is there evidence of life on mars


Life on Mars - Wikipedia, the free encyclopedia

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** Life on Mars **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
For other uses, see Life on Mars (disambiguation).
An artist's impression of what Mars' surface and atmosphere might look
like, if Mars were terraformed.
Another view of a terraformed Mars

For centuries people have speculated about the possibility of *life on
Mars* knowing to the planet's proximity and similarity to Earth. Serious
searches for evidence of life began in the 19th century, and continue via
telescopic investigations and landed missions. While early work focused on
phenomenology and bordered on fantasy, modern scientific inquiry has
emphasized the search for water, chemical biosignatures in the soil and
rocks at the planet's surface, and the search for biomarker gases in the
atmosphere.^[1]

Mars is of particular interest for the study of the origins of life,
because of its similarity to the early Earth. This is especially so as Mars
has a cold climate and lacks plate tectonics or continental drift, and has
remained pretty much unchanged since the end of the Hesperian period. At
least two thirds of Mars' surface is more than 3.5 billion years old, and
Mars may thus hold the best record of the prebiotic conditions leading to
abiogenesis, even if life does not or has never existed there.^[2]^[3] It
remains an open question whether life currently exists on Mars, or has
existed there in the past, and fictional Martians have been a recurring
feature of popular entertainment of the 20th and 21st centuries.

*Contents*

· 1 Early speculation
· 2 Habitability

· 2.1 Past
· 2.2 Present

· 2.2.1 Subsurface
· 2.2.2 Surface brines

· 2.3 Cosmic radiation
· 2.4 Nitrogen fixation
· 2.5


Source: en.wikipedia.org/wiki/Life_on_Mars

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