Red Giant Star Mira's Football Shape
Hubble's visible-light image of the disk of Mira reveals it has an odd, asymmetrical shape resembling a football. This may be tied to dramatic changes occurring during its expansion-contraction cycles, or to the presence of unresolved spots on its surface. Hubble measurements show the red giant star is 700 times larger than our Sun.
Credit: Margarita Karovska (Harvard-Smithsonian Center for Astrophysics) and NASA