Is the planet habitable?
Titan
Subsurface liquid water
Temperature: -179° C
Nitrogen dense atmosphere
No
Goldilocks zone
Primary reason why the greenhouse effect is required.
To trap heat in the atmosphere.
What percentage of Sol sized stars have planets in the Goldilocks zone?
22%
Which two types of energy are most suitable for life?
Solar/stellar and chemical(redox)
Kepler-442B
Size: 1.34x Earth's size
Temperature: -40° C
T/F A moon is required for life to be maintained
What is the ideal core for life?
A rocky core, usually iron.
How many stars are in the HZ in the Milky Way?
500 million
How old is the oldest known habitable exoplanet?
11.5 billion years - Kaptyen b
Proxima Centauri b
Orbit: 11 days
Tidally locked to star
Temperature: -39° C
Yes
How does the magnetic field of a planet support life?
Protects the planet from solar wind and cosmic rays
How does axial tilt support life?
Creates seasons and a biological incentive for evolution and diversity.
How many potentially habitable planets are actively in the catalogue?
~70 planets.
What percentage of the Sun's ultraviolet light reaches the surface?
~23% (thankfully)
Wasp - 76B
Tidal Locked
Orbit: 1.8 earth days
Constellation: Pisces
The orbit and rotation are synced so that the same side is constantly facing the star, leading to uneven temperatures
What is the primary exception for the mass limits for habitable exoplanets?
The gravitational force of large bodies such as gas giants.
What is the closest habitable exoplanet to Earth?
Proxima Centauri b
How many rocky planets with liquid water in the HZ have been identified? Answer within 5.
45
K2-18b
May have a global ocean
Dense hydrogen atmosphere
2.6x bigger than Earth
8-9x more mass than Earth
Temperature between 27°C and -27°C
Yes
Mass of a planet required to maintain life.
A little under 1 Earth Mass
Before the ~1 terranean mass lower limit was estimated, what was the generally agreed on lower limit?
0.3 Earth masses.
Name a planet near Earth mass that is geologically dead.
What is the maximum flux one can receive at sea level on Earth?
1000 W/m2