Other causes of valve disease include: 1  Deposits of calcium (calcification) in parts of the valve. 2  A floppy valve, which is a common cause of mild mitral valve regurgitation. 3  Some congenital heart problems. 4  Infection of the valve (infective endocarditis). 5  A complication of various uncommon diseases.
exists and is an alternate of . Castor is a variable star and also a quadruple star system, and has a spectral class of A1/A2 giving it a colour of white to white blue. Castor is a variable star and also a quadruple star system, and has a spectral class of A1/A2 giving it a colour of white to white blue. See link for more information.  <br /><br /> See link for more information. Castor is a variable star and also a quadruple star system, and has a spectral class of A1/A2 giving it a colour of white to white blue. <br /><br />
PROXIMA CENTAURI (ALPHA CENTAURI C). Alpha Centauri C, better known as Proxima Centauri, is the nearest known individual star to the Sun, at a distance of 4.24 light years. Proxima Centauri lies in the constellation of Centaurus (The Centaur), just over four light-years from Earth.lpha Centauri is a binary star system consisting of Alpha Centauri A and Alpha Centauri B. It is sometimes referred to as Alpha Centauri AB (Î± Cen AB).