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Rigel is a bright nearby B8 Ia supergiant star. We observed Rigel for 27.7days with the MOST satellite and monitored it's optical spectrum for over 6years. Radial velocity (RV hereafter) curve manifestly calls for tens of modesfor prewhitening. We conservatively report on the first 19 significant modes toavoid misdetection of aliases. The variability periods range from about 75 daysdown to a day. All radial modes are stable. We speculate the presence ofgravity-dominated mixed-modes excited by \epsilon-mechanism from the Hydrogenburning shell on top of He burning core.

Messages from the Core: Excited Gravity Modes in the Nearby Blue Supergiant Star Rigel (\beta Ori)