In Essence, the Kepler Mission Searched for Extrasolar Planets by

Multiple Choice

In essence, the Kepler mission searched for extrasolar planets by .

A) obtaining high- resolution photographs of other star systems
B) observing a star carefully enough to notice that it is experiencing a gravitational tug caused by an unseen planet
C) identifying spectral lines that look like what we expect to see from a planet rather than a star
D) monitoring stars for slight dimming that might occur as unseen planets pass in front of them