Plastic

Plastic covers a variety of artificial or semi synthetic polymerization products. They are composed of organic concentration or addition polymers and may contain other substances to improve performance or economics. There are few natural polymers generally measured to be "plastics". Plastics can be formed into objects or films or fibers. Their name is resulting from the fact that many are malleable, having the belongings of plasticity. Plastic can be classified in many ways but most commonly by their polymer backbone. Other classifications include thermoplastic vs. thermo set, elastomer, manufacturing plastic, addition or condensation, and Glass conversion temperature.

Plastics are polymers: elongated chains of atoms bonded to one another. These handcuffs are made up of many repeating molecular units, or "monomers". The vast bulk of plastics are composed of polymers of carbon alone or with oxygen, nitrogen, chlorine or sulfur in the backbone. The backbone is that part of the chain on the main "path" connecting the multitude of monomer units jointly.

Replicas and derivative names There is a full-size replica of Stonehenge as it would have been before decay at Maryhill in Washington state, built by Sam Hill as a war memorial. Stonehenge Aotearoa in the Wairarapa region of New Zealand is a modern adaptation aligned with the astronomy seen from the Antipodes; it was built by the Phoenix Astronomical Society from wood and sprayed concrete. The University of Missouri at Rolla has a half-scale replica located on campus, UMR Stonehenge. East Stroudsburg University, in East Stroudsburg, Pennsylvania, has a small replica on its campus dubbed "Stroudhenge".Carhenge was constructed from vintage American cars near Alliance, Nebraska by the artist Jim Reynolds in 1987. Another replica, called Stonehenge II, in Texas is constructed from an adobe-like material. Tankhenge existed in the border zone of Berlin in the early 1990s after the collapse of the Wall. Tankhenge was constructed from three ex-Soviet armoured personnel carriers.A full-size Stonehenge made out of foam — and inevitably called Foamhenge — stands near Natural Bridge, Virginia Another modern take on Stonehenge exists outside of Sante Fe, New Mexico, constructed out of junked refrigerators, known as 'Fridgehenge'. The site was created by the artist Adam Jonas Horowitz. Another full-size exact replica of what Stonehenge would have looked like 4000 years ago, also made of foam, was constructed and erected just 10 mi southwest of the actual Stonehenge. It was used for scientific and archaeological studies and was removed after.The rock band Black Sabbath featured a Stonehenge stage set for the 1983-1984 Born Again tour that ended up being too large to fit in most venues. This was parodied in the movie This is Spinal Tap, when the band orders a Stonehenge set but it arrives in miniature due to a confusion between feet and inches. There was also a Chicago based heavy metal band named Stonehenge that actually owned the trademark to the name. Stonehenge met with underground success in the 1990's - 2000's performing with acts such as Pantera, Iced Earth, Trouble and Manowar.In the MMORPG Runescape, there is a Stonehenge look-alike sometimes refered to as "Runehenge Aside from modern replicas, several other archaeological sites have had Stonehenge's name partially or fully incorporated into their own names. America's Stonehenge is an unusual and controversial site in New Hampshire. A henge near Stonehenge containing concentric rings of postholes for standing timbers, discovered in 1922, was named Woodhenge by its excavators because of similarities with Stonehenge. The timber Seahenge in Norfolk was named as such by journalists writing about its discovery in 1998.In May 2006, reports emerged of an "Amazon Stonehenge" Calcoene, 390 kilometres from Macapa, the capital of Amapa state, near Brazil's border with French Guyana. It is comprised of 127 stones, possibly forming astronomical observing points

The Sun's place in the Milky Way
The Sun may be found close to the inner rim of the Orion Arm, in the Local Fluff, at a distance of 7.94±0.42 kpc from the Galactic Center. The distance between the local arm and the next arm out, the Perseus Arm, is about 6,500 light-years. Our Sun, and thus the solar system, is found in what scientists call the galactic habitable zone.The Apex of the Sun's Way, or the solar apex, refers to the direction that the Sun travels through space in the Milky Way. The general direction of the sun's galactic motion is towards the star Vega near the constellation of Hercules, at an angle of roughly 86 degrees to the direction of the Galactic Center. The sun's orbit around the galaxy is expected to be roughly elliptical with the addition of perturbations due to the galactic spiral arms and non-uniform mass distributions.It takes the solar system about 225-250 million years to complete one orbit, and so is thought to have completed about 20-25 orbits during its lifetime or .0008 orbit since the origin of man. The orbital speed of the solar system is 217 km/s, i.e. 1 light-year in ca. 1400 years, and 1 AU in 8 days.The Hayden Planetarium uses 8.0 kpc in their interactive 3D Milky Way Atlas, which just includes the Galactic Center.