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Test question 17.1

Test question 17.1. Presence of liquid water on a habitable planet requires xEmergence of life xOutgasing from planetary interior xPolar caps vModerate temperature and sufficient atmospheric pressure. Test question 17.2.

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Test question 17.1

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  1. Test question 17.1 • Presence of liquid water on a habitable planet requires • xEmergenceof life • xOutgasingfrom planetary interior • xPolarcaps • vModeratetemperature and sufficient atmospheric pressure

  2. Test question 17.2 • A sun-like stars is observed to undergo periodic radial velocity variations of 10 m/s on a timescale of a year. If this is the reflex motion of a gas giant planet with one thousandth the mass of the Sun, the orbital speed of this planet would be • v10 km/s • x330 m/s • xSameas the star • x0.1 m/s

  3. Test question 17.3 • During a planet transit event, the host star HIDE dimmed by about 1%. The radius of the planet is • xSameas the Earth • v10% that of the star • x1% that of the star • x0.1% that of the star

  4. Test question 17.4 We need to use radial velocity measurements to verify planetary candidates found through transit observations by the Kepler mission because • xWeneed to see their images • vWeneed to eliminate possible false signals such as background binary stars • xWeneed to test Newton’s theory of gravity • xWeneed to see the evolution of these planets’ orbits.

  5. Test question 17.5 • Transit observations can be used to measure: • xPlanets’ size • xOrientationof stellar spin relative to the planets’ orbit • xPlanets’ atmospheric composition • vAllof the above

  6. Test question 17.6 Microlensing survey of planets is based on the principle of • xParallex, ie looking at distant objects from different location of the orbit. • xDoppler’seffect • xAdaptiveoptics • vEinstein’stheory of relativity

  7. Test question 17.7 Direct imaging of extra solar planets is challenging because • xPlanetsare always moving, • xPlanets’ color and luminosity are always changing • vPlanets’ light is greatly outshined by their host stars which also appear to be close to them in the sky • xMostextra solar planets appear in the sky during the day time on the Earth.

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