Future planet

Future planet

• 2.
  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
• 3.
   Habitable Zone
• 4.
  What does lifeneed? Raw materials: hydrogen, carbon, oxygen, nitrogen and minerals like iron and sulfur. Energy: Sun, volcanoes A liquid:Water
• 5.
  Jupiter’s moons Io,and Europa— way beyond the Habitable Zone
• 6.
  Europa: Water ocean,under the ice crust, melted by internal heat sources— this could be fairly common Inferred Ocean
• 7.
   Is Europatelling us to expand our definition of Habitable Planet?  Recently, we have discovered that life without the sun is possible.  Instead of photosynthesis, organisms have been discovered living in a variety of places via chemosynthesis - the use of chemical energy.  Could this happen on other worlds? A deep-sea hydrothermal vent.
• 8.
  Europa
• 10.
  Mars today
• 11.
  How to finda 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
• 12.
  Looking for habitableworlds Kepler: Look for terrestrial planets around 100,000 stars. Launch on 2006.
• 13.
  Looking for habitableworlds Darwin: Look for terrestrial planets around 1,000. Launching after 2014.
• 14.
   Tau Cetie 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
• 15.
  Conclusion