Of the First Exoplanets Found, Most Were Detected By

Multiple Choice

Of the first exoplanets found, most were detected by:

A) noting the drop in the star's light as the planet transits its disk.
B) imaging them with the HST in the infrared, where they are easier to spot.
C) noting the Doppler shifts of the star as the planet orbits it.
D) receiving radio transmissions from them, much like Jupiter emits.
E) detecting the oxygen in their atmospheres spectroscopically.