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.
Lambda Draconis is a M0 class star 334 light years away, with an apparent magnitude of 4.1. Tyl â Îµ Draconis (Epsilon Draconis) Tyl is a yellow giant of the spectral type G8III, approximately 148 light years distant. It has a visual magnitude of 3.9974. It is a relatively young star for a G class star, with its age estimated at 500 million years. Epsilon Draconis is 60 times more luminous than the Sun.