Which of the following methods describes the transit method for detecting extrasolar planets?
A) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky
B) detection of Doppler shifts in the spectra of the parent stars
C) detection of brightness changes in a star as a planet passes in front of it
D) detection of reflected starlight
Question 2
Which of the following statements regarding the determination of surface habitability and subsurface habitability of a planet is correct?
A) both surface and subsurface habitability can be determined only from robotic space probes
B) surface habitability can be determined remotely by studying reflected starlight from a planet, while determining subsurface habitability would require a robotic space probe
C) both surface and subsurface habitability can be determined by analyzing reflected starlight
D) subsurface habitability can be determined remotely by studying reflected starlight from a planet, while determining surface habitability would require a robotic space probe
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