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.
The difference between an MRI and MRA scan. How are MRI and MRA scans different? An MRI and an MRA scan are very similar, but besides the single letter at the end, they differ in what they are often used for. A MRA, or magnetic resonance angiography, is basically a type of magnetic resonance image (MRI) scan. Both tests use a strong magnetic pull and pulses of radio waves to show us images of blood vessels inside the body.