Alpha Centauri B is the companion star, or secondary, of the binary system, and is slightly smaller and less luminous than the Sun. It is a main-sequence star of spectral type K1 V, making it more an orange color than the primary star.Alpha Centauri B is about 90% the mass of the Sun and 14% smaller in radius.lpha Centauri (Î± Cen), also known as Rigil Kent (/ËraÉªdÊÉl ËkÉnt/) or Toliman, is the closest star system to the Solar System at 4.37 ly (1.34 pc).
A magnetic resonance angiogram (MRA) is a type of magnetic resonance imaging (MRI) scan that uses a magnetic field and pulses of radio wave energy to provide pictures of blood vessels inside the body.
Mutual recognition agreement. A mutual recognition agreement (MRA) is an international agreement by which two or more countries agree to recognize one another's conformity assessments. A mutual recognition arrangement is an international arrangement based on such an agreement. MRAs have become increasingly common since the formation of the World Trade Organization in 1995. They have been forged within and among various trade blocs, including APEC and the European Union.