Kepler-9c
... that exoplanet Kepler-9c has an orbit that decreases by 39 minutes every time it circles its star?
... that <a class="mw-redirect" href="./Extrasolar_planet" id="mwBxE" rel="mw:WikiLink" title="Extrasolar planet">exoplanet</a> <b id="mwBxI"><a href="./Kepler-9c" id="mwBxM" rel="mw:WikiLink" title="Kepler-9c">Kepler-9c</a></b> has an orbit that decreases by 39 minutes every time it circles its star?