Astronomers have discovered an earth-sized exoplanet, designated TOI-2431 b, that is so close to its host star that it completes a full orbit in just 5 hours and 22 minutes.1,2 Or, to put it another way, this planet’s year is less than six hours long! Astronomers designate exoplanets having orbital periods less than one Earth day long as ultra-short period (USP) exoplanets. Out of the approximately 6,000 known exoplanets, a… More…
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