Luminous blue variable stars showcase a spectacular and rare unstable stage in the death of massive stars. These supergiant stars can rapidly and unpredictably change both their brightness and spectra in outbursts that can last for decades. Some giant eruptions produce nebula that surround the star. Although known for centuries, the identification of the underlying physics remains elusive, and new behaviors continue to be discovered. Long programs of periodic monitoring have produced important pieces of this, as yet, unsolved puzzle. Understanding this dramatic phase will help complete the sequence of massive star development and delineate the progression to the final stellar death as a supernova explosion.... Read More | Share it now!

يمكن يكون النوت ٨ مناسب لك وهنا بعض الاسباب، للتوضيح اذا انت من محبين الايفون فهو نظام مختلف وهنا الحديث عن نظام الاندرويد وسلسلة النوت فقط
انت المسؤول تختار الانسب لك من نظام جوال ،، ومن ثم الجوال الانسب لك ... Read More | Share it now!