The mass loss from evolved stars is one of the long-standing problems in stellar astrophysics in spite of its importance in stellar evolution as well as in the chemical enrichment of galaxies . We have recently succeeded not only in imaging the surface of the red supergiant supernova progenitor Antares in the 2.3 micron CO lines in unprecedented detail with a spatial resolution of 5 milliarcseconds but also in witnessing, for the first time, the complex gas dynamics over the surface and atmosphere of the star. The velocity field map reveals vigorous upwelling and downdrafting motion of large gas clumps in the atmosphere extending out to 1.7 stellar radii. This suggests that the mass loss in red supergiants may be launched in a turbulent, clumpy manner. We will also present the preliminary results of the next step of this velocity-field imaging: 3-D tomographic velocity-field imaging throughout the stellar atmosphere. Our work opens an entirely new window to observe stars just like in observations of the Sun, bringing stellar astrophysics to a new dimension.