• What are the basics requirements for life?
• Could life have arisen elsewhere in solar system?
• Are there other planets like Earth?
• How likely is the evolution of intelligent life?
Basics requirements for life
Hellicobacter pylori
• Major atoms in abundance
• Constant temperature
• Medium for molecular interaction
• No nocive cosmic radiation
• Source of energy
Solar System
-170ºC – 120ºC
No atmosphere
¿Outside solar system?
Exoplanet
• Orbits around a star
• Does not produce light
• Reflects one billionth of its star light
• Mass under 13MJUP
Stars are form
Dust Disk
Planets may be formed in the flattened disc
Brown Dwarf
False Discoveries
The first exoplanets were discovered…
around a pulsar!
A. Wolszczan and D. Frail (1991)
PSR1257+12
51 Pegasi b
First planet discovered orbitting a Principal Sequence Star
T = 4 days, M = 0,5 MJUP
M. Mayor and D. Queloz (1995)
Radial Velocity
Radial Velocity
Astrometry
Astrometry
Photometry
Photometry
Gravitational Lensing
Distance to Pleiades 370pc
Farest Away planet detected byRadial Velocity / Astrometry ~400pc
Transit / Microlens / Pulsar ~6,5kpc
Milky Way Radius ~15kpc
Search for ExtraTerrestrial Intelligence
Voyager gold record
Voyager gold record
“We are a way for the universe to know itself”
Carl Sagan
Thank you
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