Mars/Mercury Solar Orbital A coordinatesystem related to Mars or Mercury. A coordinate system where, depending onthe body (Mars or Mercury), X is anti-sunward, Y along the orbital velocitydirection.
A cool, red star of spectral type M with a surface temperatures of less than 3600 K. The spectra of M stars are dominated by molecular bands, especially those of TiO. Naked-eye examples are Betelgeuse
and Antares.
A cool, red star of spectral type M with a surface temperatures of less than 3600 K. The spectra of M stars are dominated by molecular bands, especially those of TiO. Naked-eye examples are Betelgeuse
and Antares.