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Stars, like people, come in a dazzling array. There are stable yellow-white stars, like the Sun; there are ginormous, blazing, short-lived behemoths, and small, dim red dwarfs.
"We believe that the planet rotates synchronously, so that the same side, called the day side, always faces the star, just likeUltracool dwarfs, while far more numerous in the Milky Way than bigger stars, are somewhat challenging to study because they are so small, cool and dim.project – aka the Search for habitable Planets EClipsing ULtra-cOOl Stars – enters the fray. It's a network of telescopes working together specifically to search for Earth-like exoplanets orbiting tiny stars.
The star around which the exoplanet whirls is tiny, just 12.3 percent of the Sun's radius and 10 percent of the Sun's mass. It's less than half the Sun's temperature – and 1,000 times dimmer. Even as close as it is to us at just 55 light-years away, this tiny star is difficult to make out. The first is its radius. A world as small as SPECULOOS-3b is unlikely to be a gaseous or icy one, according to our current understanding of planet formation and evolution. We may be wrong there, but there's another factor at play: the star itself.
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