VAravinthan 2011FM034 WHO WE ARE WHAT IS LIFE The condition that distinguishes animals and plants from inorganic matter including the capacity for growth reproduction functional activity and continual change preceding death ID: 278740
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Slide1
THE Extraterrestrial life
V.Aravinthan
2011/FM/034Slide2
WHO WE ARE?Slide3
WHAT IS LIFE?
The condition that
distinguishes
animals and plants from inorganic matter
, including the capacity for growth, reproduction, functional activity, and continual change preceding death .Slide4
LIFE AS WE KNOW IT REQUIRES
Liquid water.
Some form of energy (e.g. sunlight, chemical, volcanic).
Access to organic materials (e.g. carbon compounds).
A sufficiently stable environment (i.e. time to originate and evolve).Slide5
A HABITABLE WORLD
Distance
from
its
star
, not too far, not too closeSize, not too big, not too smallAtmosphere to keep the planet warm and water liquidWater
JUST LIKE EARTH!!!Slide6
HOW BIG THE UNIVERSE IS???
The Earth
Solar system
The Galaxy
Local Group of galaxies
Cluster of galaxies
Super cluster of Galaxies
There may be around 10
21 stars in the observable universe…Slide7
IN THE OBSERVABLE UNIVERSE...
400 billion stars
50 million planets
If we take 1% of them are habitable
Around 500 million planets will have life formsSlide8
DRAKE’S EQUATION
The
Drake equation
is a mathematical equation used to estimate the number of
detectable extraterrestrial civilizations
in the Milky Way galaxy.
N= R*
f
s*fp*ne*fl*fi*fc*LMinimal Value is in millionsSlide9
LOOKING FOR HABITABLE WORLDS
Kepler
(2006)
-
Look
for
terrestrial planets around 100,000 stars.Terrestrial Planet Finder (TPF)- 2015-Look for terrestrial planets around 100 nearby stars.Eddington (2008) - Looking for
planets
bigger
than
Mars
around
500,000
stars
.
Darwin (2015)
-
Look
for
terrestrial
planets
around
1,000
stars
.Slide10
INTELLIGENT LIFE???
Arecibo Antena,
Puerto RicoSlide11
THE PIONEER MESSAGESlide12
SETI
Allen arraySlide13
NEW EVIDENCES
Wikileaks
documents.
Cable no –
10
DUSHANBE8
2Slide14
REPORTED SIGHTINGS-MUFONSlide15
ARGUMENTS AGAINST ET LIFE
Fermi’s paradox
Contradiction
between the high probability that extraterrestrial civilizations exist and the lack of contact with these civilizations
Rare Earth Hypothesis
The
emergence of complex multi cellular life on Earth required an improbable combination of astrophysical and geological events and circumstances.Slide16
SCIENTISTS THOUGHTS...
Of course it is possible that
UFO's really do contain aliens
as many people believe, and the Government is hushing it up
. (Stephan Hawking)
Given the millions of billions of Earth-like planets,
life elsewhere in the Universe without a doubt, does exist
. In the vastness of the Universe
we are not alone. (Albert Einstein)Slide17
THERE ARE TWO POSSIBILITIES
May be we are alone….
May be
w
e are not….
Both are equally amazing.Slide18
SOMEWHERE, SOMETHING INCREDIBLE IS WAITING TO BE KNOWN.
THANK YOU