- Boötes_IAU.svg (Wikimedia Commons)
- Lithosphere (Wikipedia)
A lithosphere (from Ancient Greek λίθος (líthos) ‘rocky’, and σφαίρα (sphaíra) ‘sphere’) is the rigid, outermost rocky shell of a terrestrial planet or natural satellite. On Earth, it is composed of the crust and the lithospheric mantle, the topmost portion of the upper mantle that behaves elastically on time scales of up to thousands of years or more. The crust and upper mantle are distinguished on the basis of chemistry and mineralogy.
- Alkalurops (stars.astro.illinois.edu)
ALKALUROPS (Mu Bootis). The naming of stars sometimes seems random. Some bright stars within a constellation will carry no proper names, while other much fainter ones do (the classic case that of Gamma Cassiopeiae). In Bootes, the Herdsman, the Alpha, Beta, and Gamma stars carry the proper names Arcturus, Nekkar, and Seginus. Third magnitude Delta has none, but then we can reach all the way to fourth magnitude (4.31) Mu Bootis, which is called by the jaw-breaking name Alkalurops.