Brass, which is an alloy of copper and zinc, has been used since at least the 10th century BC in Judea and by the 7th century BC in Ancient Greece. Zinc metal was not produced on a large scale until the 12th century in India and was unknown to Europe until the end of the 16th century.any alloys contain zinc, including brass, an alloy of copper and zinc. Other metals long known to form binary alloys with zinc are aluminium, antimony, bismuth, gold, iron, lead, mercury, silver, tin, magnesium, cobalt, nickel, tellurium and sodium.
The stars move parallel to each other and the Celestial Equator. Since the Celestial Equator is on the Horizon, each star has constant altitude. No star rises or sets; all stars are circumpolar.
Yes, everything that appears as a point like star is in the Milky Way. The most nearby stars outside of the Milky Way are in the dwarf galaxies that are Milky Way satellites, such as the Large and Small Magellanic Clouds. These appear as fuzzy little blobs to the naked eye, just as Andromeda does. The only exception to this that I can think of is when a supernova occurs in a nearby galaxy.