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" ... Scientists look for planets orbiting ultracool dwarf stars because cooler stars are comparatively dim. Dimmer is better in the search for an exoplanet — the term used to denote planets outside of our own solar system — because researchers look for dips in a star’s light signals. Brighter stars have glare which can make it harder to see these dips, which hint that a planet is passing by and briefly blocking light. ... "