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.
Magnetic resonance angiogram (MRA) of blood vessels. Magnetic resonance angiogram (MRA) of blood vessels. Courtesy of Intermountain Medical Imaging, Boise, Idaho. Figure 1 and Figure 2 show MRAs of the normal smooth appearance of the large blood vessel (aorta) that carries blood from the heart. Figure 3 shows an MRA of a narrowed and abnormal aorta from the buildup of calcium and fat (cholesterol) in the inner lining of the artery, often called hardening of the arteries (atherosclerosis).