Abstract
This paper describes the origins of comets, large and small. The author points out the effects of the impact of a large comet with the Earth in Tunguska, Russia in 1908 and its effects on the atmosphere.

From the Paper
"Comets consist of rock ice and organic compounds and they can be several miles in diameter. They are thought to originate from a region which is beyond the orbits of the outermost planets and scientists believe that gravitational perturbations jolt them ..."

Tags:comets, Tunguska event, atmosphere, water

Abstract
This paper explores comets; the astronomical bodies made up of frozen gases and dust particles, which orbit the solar system. The author discusses how comets develop, their structure, their volatility, and the important role that comets play in the revolution of astronomy and cosmology. The paper also contains a detailed description of Halley's Comet.

From the Paper
"Comet structures are diverse and very dynamic, but they all develop a surrounding cloud of diffuse material, called a coma, that usually grows in size and brightness as the comet approaches the Sun. Usually a small, bright nucleus (less than 10 km in diameter) is visible in the middle of the coma. The coma and the nucleus together constitute the head of the comet."

Tags:tail, halley, nucleus, sun, orbit, moon, astronomy, greece, cosmology, ice, space, molecule

Abstract
This paper shall examine comets from a research perspective. It will present a very simplified explanation of the nature of the comet, as well as the role comets have played in human history.

Abstract
This paper explains the composition of comets and clarifies what happens that gives them their shimmering appearance. It explains the various types of comets and elucidates the close link between the orbit of comets and the orbit of meteor showers. It lists the commonly seen features when a comet is near the sun and concludes by looking at factors resulting in a change in the behavior of a comet.

From the Paper
"In outer space there are many things that man is still trying to fathom, and he has been intrigued by many things high up in the sky, but yet has not been able to figure out what they are or what they may mean. The field of astrology is one that began thousands of years ago with the Egyptians being the first known astronomers. They were the ones who created the first map of the North Star that is used till today to trace the movements of our planet and the heavenly bodies around it."

Tags:composition, appearance, types, orbit, meteor, showers, features, change, behavior

Abstract
This paper examines Comet Halley. Comets have historically been associated with danger, catastrophe and astrology. However, from the discovery of their periodicity three centuries ago to the Giotto expedition that intercepted the last apparition of the Comet Halley (A1) in 1986 provide valuable astronomical data.

Abstract
This paper begins with a discussion about the astronomer who first identified Halley's comet, Edmond Halley, and how he was able to make his observations and identification of the comet. The paper then continues with a look at when Haley's comet was first observed and photographed, a look at how long the comet has been in existence, and a brief discussion of NASA's involvement in studying the comet. The paper concludes with a description of the comet's appearance, composition, density, and orbit.

From the Paper
"A comet is " a small celestial body consisting mostly of dust and gases that moves in an elongated elliptical or nearly parabolic orbit around the sun" (Encyclopedia.com). Comets are rarely visible from the earth, but when they can be seen, their visibility can last anywhere from a few days to a few months (Columbia Encyclopedia). Most comets are invisible to us on earth except when they are near the sun and comets are usually only visible at sunrise or sunset. There have been many comets discovered by astronomers throughout time, but the most well known is "Halley's Comet", also known as Comet Halley."

Tags:periodic, laws, of, motion, gravity, solar, system, calculate, reappear, return, time, period, discovery

Abstract
The paper details the philosophy behind Comet's use of solar energy to power their production facilities and use of green materials to build their boards. The paper discusses how Comet's owners established a local stock exchange where small, local entrepreneurships are nurtured into successful businesses that hire and train people in socially and environmentally responsible methods. The paper then explains how Comet Skateboards received the financial support to upgrade their small business to a national, high-visibility company.

From the Paper
"So many companies and organizations are riding the "green" bandwagon these days - claiming to be responsible stewards of our fragile earth vis-a-vis our rapidly changing climate - it's hard to tell those employing cool marketing techniques - but little substance - from those truly committed to reducing their carbon imprint. Even oil companies like BP are flashing their green through commercials and investment in renewable energy sources. But when it comes to Comet Skateboards, there is no doubt about the sincerity of this company's production and marketing strategies. Comet in fact goes farther into the realm of a sustainable "cradle-to-cradle" business model than most if not all manufacturers of popular contemporary products."

Tags:environment, sustainability, forests, local, stock, exchange, microlending

Abstract
This paper presents a discussion about the scientist Edmond Halley. Halley is credited with the naming and discovery of Halley's comet but he was responsible for many other scientific works in addition to the comet. The author takes on a journey through the life of Halley and explains who he was and what his life works were about.

Abstract
This paper discusses the Comet jet airplane accidents of the early 1950's, and the profound effects they had on certain aspects of our society. The author examines the various effects a technological disaster has on our lives and the world around us, as well as how our views towards the technology may be altered after a technological disaster.

From the Paper:

"By examining the jet aircraft industry, but in particular the British jet aircraft industry after the accidents, we are able to gain insight into what people's conceptions were, and why certain events unfolded as they did. With any technological disaster, trust in the product is often lost very quickly, and various actions are often taken to try and restore this trust. By examining these actions we can better understand how many people felt about the technology after the disasters. Lastly, not all technological disasters have purely negative connotations. Much can be learned from technological accidents that eventually lead to important improvements in the technology. By examining one major technological failure and its various effects we can gain a better understanding of how we are affected by technology as well as how our views towards the technology may be altered."

Tags:airplane, disaster, effects, history, social, technology, aircraft, industry

Abstract
This paper gives an in-depth description of the Oort cloud, which is a region of space outside the orbit of the planets from which comets emerge. According to the paper, this region has never been seen but has only been inferred by statistical models of the orbits of the comets. The paper further discusses the work of Dutch scientist Oort who determined that the area must exist and offered an assessment of some of the processes involved. The paper concludes by considering futher robotic flights which may be able to gather more data and see the cloud directly.

From the Paper
"The Oort cloud is a region of space outside the orbit of the planets from which comets emerge. This region has never been seen but has only been inferred by statistical models of the orbits of the comets. A Dutch scientist named Oort determined that the area must exist and offered an assessment of some of the processes involved. In the future, a robotic flight may be able to gather more data and see the cloud directly. A number of issues are to be resolved by researchers, and direct observation would be one way to achieve this. Comets were long seen as harbingers of disaster, probably because of their infrequent appearance and because of the way they moved through the sky in..."

Tags:oort, cloud, research