Newtonian telescope secondary mirror. This design reduces the size and cost of the telescope with a shorter overall telescope tube length (with the corrector extending the focal length in a "telephoto" type layout) combined with a less costly spherical mirror. Commercially produced versions of this design have been noted to be optically compromised due to the difficulty of producing a correctly shaped sub-aperture corrector in a telescope targeted at the inexpensive end of the telescope market. Newtonian telescope The Newtonian telescope, also called the Newtonian reflector or just the Newtonian, is a type of reflecting telescope invented by the English scientist Sir
Galilean the members of a fanatical sect (Zealots), followers of Judas of Galilee, who fiercely resented the taxation of the Romans, and whose violence contributed to induce the Romans to vow the extermination of the whole Galilean race. "Galileans" was also term used by some in the Roman Empire to name the followers of Christianity, called in this context as the Galilaean faith. "Galilean", as an adjective, describes some aspects of mathematics or astronomy associated with Galileo: see for example Galilean moons and Galilean transformation. "Galileans" are also a fictional race of living planets in the "Ben 10" universe that possess