NGC 2841 is a compact flocculent spiral galaxy, a member of the nearby Leo cloud. Among other things the galaxy has been host to 4 supernovae in the last century. NGC 2841 has what is known as a "decoupled nucleus". The chemical abundances of the nucleus were found to be substantially different from its inner bulge. In addition, ionized gas in the nuclear region is rotating at a perpendicular axis to the inner disk, known as a nuclear "polar ring". Astronomers have concluded that the decoupled nucleus and polar ring most likely have an external origin. NGC 2841 most likely experienced an encounter with a gas rich galaxy several billion years ago. Gas was accreted from the smaller galaxy and settled into the nucleus where it established an independent rotation. Star formation then occurred from the captured gas producing a secondary chemically decoupled stellar population. Another well known galaxy NGC 7331 also has a decoupled nucleus and polar ring most likely based on the same scenario as NGC 2841.