The characteristics measured by semen analysis are only some of the factors in semen quality. One source states that 30% of men with a normal semen analysis actually have abnormal sperm function.
Wisps of dust and gas from the nebula which formed the star can also be seen. Credit: Atlas Image courtesy of 2MASS/UMass/IPAC-Caltech/NASA/NSF. Named for the first of their type observed, T Tauri stars are variable stars which show both periodic and random fluctuations in their brightnesses. They are newly-formed (< 10 million years old) low to intermediate mass stars (< 3 solar masses) with central temperatures too low for nuclear fusion to have started.
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).