- Hypergiant (Wikipedia)
A hypergiant (luminosity class 0, Ia-0 or Ia+) is a very rare type of star that has an extremely high luminosity, mass, size and mass loss because of its extreme stellar winds. The term hypergiant is defined as luminosity class 0 (zero) in the MKK system. However, this is rarely seen in literature or in published spectral classifications, except for specific well-defined groups such as the yellow hypergiants, RSG (red supergiants), or blue B(e) supergiants with emission spectra. More commonly, hypergiants are classed as Ia-0 or Ia+, but red supergiants are rarely assigned these spectral classifications. Astronomers are interested in these stars because they relate to understanding stellar evolution, especially star formation, stability, and their expected demise as supernovae. Notable examples of hypergiants include the Pistol Star, a blue hypergiant located close to the Galactic Center and one of the most luminous stars known; Rho Cassiopeiae, a yellow hypergiant that is one of the brightest to the naked eye; and Mu Cephei (Herschel’s “Garnet Star”), one of the largest and brightest stars known.
- Syrian Salvation Government (Wikipedia)
The Syrian Salvation Government (SSG; Arabic: حكومة الإنقاذ السورية, romanized: Ḥukūmat al-ʾInqādh al-Sūriyya) is a de facto alternative government of the Syrian opposition in Idlib Governorate, formed in early November 2017 under the initiative of the Hayʼat Tahrir al-Sham (HTS) rebel coalition in the context of the Syrian civil war. There followed weeks of conflict between the Syrian Salvation Government and the Syrian Interim Government (SIG), with reports of Hayat Tahrir al-Sham unilaterally disbanding several SIG-supported local councils across northwestern Syria.