Most are composed of frozen gas. However, some are composed of frozen gas and non-volatile grains. They usually follow very strict paths around the sun. Comets become most visible when they cross the sun. This also applies to people who view comets with telescopes.
Its distance is between five thousand and 100 thousand AU. It is believed that long-period comets that now orbit the Sun were originally from the Oort cloud. Short-period comets come from the Kupier belt. The Kuiper Belt is a doughnut-shaped ring, extending just beyond the orbit of Neptune from about 30 to 55 AU. ("Kuiper Belt & Oort Cloud: Overview," n.d.) Astronomers also presume that this is the origin of Halley’s Comet.
It was then given the designation 1993e by the International Astronomical Union's Central Bureau for Astronomical Telegrams. This designation shows that Shoemaker - Levy 9 was the fifth comet discovered in 1993. On May 22, 1993 Bureau Director Brian G. Marsdon reported that Shoemaker - Levy 9 could very well hit Jupiter by October of 1993. On October 18, 1993 Paul W. Chodas and Donald K. Yeomans reported to the American Astronomical Society's Division of Planetary Sciences that the probability of impact of Shoemaker - Levy 9 into Jupiter was greater than 99%. They stated that the fragments would hit over a period of several days in the month of July 1994.
Radiometric dating of chondrites has placed them at the age of 4.55 billion years, which is the approximate age of the solar system. They are considered pristine samples of early solar system matter, although in many cases their properties have been modified by thermal metamorphism or icy alteration. Comets Now we know that comets are lumps of ice and dust that periodically come into the center of the solar system from somewhere in its outer reaches, and that some comets make repeated trips. When comets get close enough to the Sun, heat makes them start to evaporate. Jets of gas and dust form long tails that we can see from Earth.
COMETS Comets have been witnessed ever since man has been speculating about objects in the nighttime sky and appear in records from the beginning of recorded civilization (Schweighauser 20). Comets are made up of four distinct features. The first is the nucleus. The nucleus is made up of frozen gases, mostly water vapor with lesser amounts of carbon dioxide and carbon monoxide, and imbedded in the frozen gases are interplanetary dust and tiny fragments of stony and metallic meteoric material. Some comets, the larger ones, have a nucleus of 10 kilometers (Schweighauser 22).
The astronomical unit provides a convenient way to carry out any astronomical calculations. It also stated that ... ... middle of paper ... ...t earth was in 2004 and it’s called Apophis. It destroyed twenty-five percent of life. Comets are made up of ice and dust. They are known as dirty snowballs because they contain left overs from the forming of stars.
Asteroids Sixty-Five million years ago, 70 percent of life on Earth died. The most reasonable and possible reason this happened was an asteroid. An asteroid hit the Earth very hard, and in doing this, dirt and dust from the impact stayed in the air and it blocked out sunlight, that’s why the dinosaurs died. An asteroid is a rock from outer space. Asteroids have orbited the Sun along with the planets since the solar system formed about 4.6 billion years ago, but it’s only been 200 years since we first discovered them.
A comet is categorized as an icy body that discharges gas or dust. Most comets that are visible from earth seem to travel in long ovals around the sun. Comets consist of a nucleus which is bounded by fuzzy or cloudy atmosphere and it might have a tail or two. The gases in the comet’s coma and tail are bright reflective so that allows us to see comets a lot better when they are closer to the sun. Astronomers also trust that comets release the energy they store from the sun causing them to glow.
Solar radiation causes the ice to melt, so as to form the two structures, and gravity conforms them into the shapes that we observe in the night sky. These two fac... ... middle of paper ... ... can be compared and contrasted in a multitude of diverse ways. Asteroids are composed of rocks and minerals while comets are made up of rocks and minerals but mostly ice. Although they are roughly made up of similar material, they have very different orbital paths around our solar system. Asteroids have a sophisticated orbital path around the sun.
A falling star is really a Meteor and is a form of space debris. They are not really stars at all. There are cases where meteors have entered the Earth’s atmosphere. In most cases, Meteors burn up upon entry into the atmosphere and never make it to the surface of the planet. There are times when the meteor starts to burn up, but because the mass is big enough, it makes it to the surface, smaller then when it started out.