What a run it was: For about four years, the Kepler space telescope watched more than 100,000 stars, looking for very slight dimming — a sign that a planet had crossed in front. (discovermagazine.com)
Astronomers detected the planets using the Kepler telescope, which measures the slight dimming of a star's light caused by orbiting planets passing in front of it. (scientificamerican.com)
Both Kepler and TESS are designed to scan the sky for planetary transits, the slight dimming that occurs when a planet moves across the face of a star and temporarily blocks some of its glow. (scientificamerican.com)