• 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