Telescope is an instrument that gathers light and allows
it to be magnified by way of an eyepiece, or ocular. History
points the invention of the telescope to Hans Lippershey,
a Dutch spectacle maker. Later, in the early 1600's, it
was re-invented by Galileo. On the night of April 14, 1611,
a banquet was held in his honor outside Rome. Galileo showed
the guests his instrument and let them see his discoveries.
An unidentified Greek poet-theologian happened to be present
and he proposed a name for the instrument, one borrowed
from ancient Greece. It was quickly accepted and the host,
Federico Cesi, then officially christened Galileo's instrument, "the
telescope." There are many different styles of telescopes,
but the two most common are the Newtonian Reflector, named
after Isaac Newton, and the Refractor. Cassegrains, Maksutov's,
and variations of both are styles that are very popular
amongst both professional and amateur astronomers alike.