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.
Whatâs That Very Bright Star â Is it the Planet Jupiter? Have you seen a very bright star rising in the East every night the past few months? If youâre a night owl, you may have noticed it moves across they sky from the East into the West, shining brightly throughout the night. However this object is not a star! Itâs the planet Jupiter and it is the brightest object in the night sky at the moment, apart from the Moon. At the end of October Jupiter will be at opposition.