Future planet
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Transcript of Future planet
A habitable world
Distance from its star, not too far, not
too close
Size, not too big, not too small
Atmosphere to keep the planet warm
and water liquid
Water
Habitable Zone
What does life need?
Raw materials: hydrogen, carbon,
oxygen, nitrogen and minerals like iron
and sulfur.
Energy: Sun, volcanoes
A liquid: Water
Jupiter’s moons Io, and Europa—
way beyond the Habitable Zone
Europa: Water ocean, under the ice crust, melted
by internal heat sources— this could be fairly
common
Inferred Ocean
Is Europa telling us to expand our
definition of Habitable Planet?
Recently, we have discoveredthat life without the sun ispossible.
Instead of photosynthesis,organisms have beendiscovered living in a varietyof places via chemosynthesis- the use of chemical energy.
Could this happen on otherworlds?
A deep-sea hydrothermal vent.
Europa
Mars today
How to find a planet?
Problem:
The stars emit light (a lot!) and planets doesn’t, they just
reflect the light from their parent star.
How to solve it?
Cover the star!!!!
Measure the effects of the planets on the stars:
Stars wobble because of the planets
Stars dim when a planet crosses in front of them
Looking for habitable worlds
Kepler:
Look for
terrestrial
planets around
100,000 stars.
Launch on
2006.
Darwin:
Look for terrestrial planets around 1,000.
Launching after 2014.
Looking for habitable worlds
Tau Ceti e is an unconfirmed planet that may be orbiting the
nearby Sun-like star Tau Ceti e at a distance of 11.905 light
years from the Sun.
If we travel in 18 km/s speed, we reach Tau Ceti e at
1.97×1011 years
Conclusion