TESS carries four 16.8-megapixel cameras, each fitted with four red-sensitive CCD detectors, designed to detect planets transiting in front of their host stars. The cameras will search for brief dips in starlight to find the planets, and sophisticated software algorithms will allow astronomers to scan wide swaths of the sky once full-frame images are downlinked to Earth.

During TESS’s two-year, $337 million mission, the MIT-built cameras will survey more than 85 percent of the sky, looking at approximately 200,000 pre-selected bright, nearby stars, including the 6,000 or so stars that are visible to the naked eye in the night sky.

TESS will primarily look at M-dwarf stars, which are smaller and cooler than the sun, and make up the majority of the stars in the Milky Way galaxy. Also called red dwarfs, the stars that are TESS’s focus have not been thoroughly investigated to determine whether they harbor their own solar systems.

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