- 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.
- Big Four Mountain (summitpost.org)
Big Four has big fame in the Northwest. At least that’s what I’ve always thought. Its fame stems from two seeds of awe: the stupendous North Face and the ice caves at the foot of the North Face. The North Face is plainly visible from the highway (Mountain Loop Highway) at several locations and from the viewpoint/picnic area near the highway. This face is 4,000 ft high. It rises like a palisade from the ice caves in a series of high-angle ribs and gullies. The ribs rise up to form five distinct nubs that look like brass knuckles. Indeed the symbolism is apt, for there is no easy way to the top of this peak and it might beat you up if you try. The peak is everywhere rugged. The easiest route is from the east (from Dry Creek). The North Face relents with difficult ice climb routes but it is generally avoided in summer (loose rock). The NE Ridge contains a hard rock route called the Tower Route.