Test question 17.1

• Presence of liquid water on a habitable planet requires

A) xEmergence of lifeB) xOutgasing from planetary interiorC) xPolar capsD) vModerate temperature and sufficient

atmospheric pressure

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

A) v10 km/sB) x330 m/sC) xSame as the starD) x0.1 m/s

Test question 17.3

• During a planet transit event, the host star HIDE dimmed by about 1%. The radius of the planet is

A) xSame as the EarthB) v10% that of the starC) x1% that of the star D) x0.1% that of the star

Test question 17.4

We need to use radial velocity measurements to verify planetary candidates found through transit observations by the Kepler mission because

A) xWe need to see their imagesB) vWe need to eliminate possible false signals such as

background binary starsC) xWe need to test Newton’s theory of gravityD) xWe need to see the evolution of these planets’

orbits.

Test question 17.5

• Transit observations can be used to measure: A) x Planets’ sizeB) xOrientation of stellar spin relative to the

planets’ orbitC) xPlanets’ atmospheric compositionD) vAll of the above

Test question 17.6

Microlensing survey of planets is based on the principle of

A) xParallex, ie looking at distant objects from different location of the orbit.

B) xDoppler’s effectC) xAdaptive opticsD) vEinstein’s theory of relativity

Test question 17.7

Direct imaging of extra solar planets is challenging because

A) xPlanets are always moving,B) xPlanets’ color and luminosity are always changingC) vPlanets’ light is greatly outshined by their host

stars which also appear to be close to them in the sky

D) xMost extra solar planets appear in the sky during the day time on the Earth.