“He glimpsed a falling star in the west, like a match scratched against the sky, then returned to his room and rationed out three chapters of Two Years Before the Mast before going to sleep.” (99) – Metaphor caught my attention. – Sometimes things like this can bring peace to you and you just have that sense of feeling that you’re ok. – Stuff like this (shooting stars) doesn’t happen very often in most places.…
4. How are comets different from asteroids? One of the main differences between comets and asteroids are what they are made of. Asteroids are made up of metals and rocky materials while comets are made up of ice, dust and rocky material. Asteroids formed near the sun while comets farther away. Comets have tails while asteroids don’t. Also another difference is their orbit patterns.…
For a long period which could have lasted several years, dust and other debris from the impact formed a layer on the surface of the Earth.(13) This may have caused a threat to the survival of terrestrial animals.(13) Sunlight was unable to reach the surface of the Earth and this would have contributed to the cooling effect.(13) This layer on the Earth would have been created when the intense force of the asteroid hit Earth in the second stage which caused small pieces of earth and dust to scatter.(13) The intense wind following the event would have contributed to the spread of the debris.(7) After the asteroid, the sky would have darkened and would not have returned to its normal state for a number of months or even years.(7) The darkening of the sky must have been caused by the release of gases and distribution of dust.(7) The gases released included 10,000 billion tonnes of carbon dioxide, 100 billion tonnes of carbon monoxide and 100 billion tonnes of methane.(7) This release would have also temporarily destroyed the ozone layer.(7) The darkening of the sky made photosynthesis difficult and threatened the food chain as many plants were unable to grow.(7) Photosynthesis relies heavily on the sunlight and the darkness of the sky restricted the amount filtering through to the…
1. Explain how observed teleconnection patterns can help in the preparation of a seasonal weather forecast.…
A nebula, an immense cloud of hydrogen gas and dust, condenses into smaller regions of matter. On occasion, one of these regions collapses under the force of its own gravitational attraction, often triggered by an outside force, like a nearby supernova-an explosion of a star. After the collapse of a cloud, atoms begin gravitating together to form a condensed center. The condensed center is a protostar. As gravity pulls in more gas and dust, pressure builds, causing the protostar core to heat up. Clouds and matter begin to rotate around the protostar and flatten due to their rotation. They surround the protostar like a rotating disk. The protostar continues to grow and its core continues to heat. When the core is hot enough, nuclear fusion begins. The start of nuclear fusion is technically the beginning of a star's life. Eventually, when the nuclear energy runs out, the star dies. Depending on the size and mass of the star, it can go through many stages and die in different ways-one of those ways being a supernova.…
A Halo is a burst of light produced by ice crystals creating colored or white arcs and spots in the sky. Many are near the sun or moon but others are elsewhere and even in the opposite part of the sky. They can also form around artificial lights in very cold weather when ice crystals called diamond dust are floating in the nearby air.…
Dr. Iain Stewart (geologist) explains how the earth was formed. The earth was nothing but comets and asteroids circling the sun. These bits of rock contained water, metals, and other essential elements that are now found on earth. http://www.bbc.co.uk/science/earth/earth_timeline/earth_formed#p00fzslq…
Planetary nebula: Glowing gas that surrounds a central star, they’re formed when a star 8 solar masses or less has finished fusing helium surrounding a core of carbon and oxygen. The star becomes unstable but its small size cannot fuse heavier elements. It pulsates and throws outer material into space. The gas glows as it is being radiated by the remaining part of a star which eventually turns into a white…
They are formed by the impact of chunks of interplanetary matter (meteorites) striking the surface.…
An impact crater (impact basin or sometimes crater) is a circular depression on a surface, usually referring to a planet, moon, asteroid, or other celestial body, caused by a collision of a smaller body (meteorite) with the surface. In the center of craters on Earth a crater lake often accumulates, and a central island or peak (caused by rebounding crustal rock after the impact) is usually a prominent feature in the lake.…
If any part of a meteoroid survives the fall through the atmosphere and lands on Earth, it is called a meteorite.…
However, each time a comet passes by the sun through its orbit pattern, it loses so much of its material compound that it could not last longer than roughly one-hundred thousand years. Due to research, scientist have given comets an average age of ten-thousand years before they disintegrate. Scientist explain this theory by examining where comets actually come from. Comets originate in an unobserved spherical “Oort Cloud” well beyond the orbit of Pluto. There gravitational interactions with passing stars often knock comets into our solar system. When the comet passes by either planets, or the sun, the gravitational pull often breaks up the comet. According to history and past records as far back as 4004 B.C.E, there have only been a couple hundred comets observed. The “Kuiper Belt” is a disc of supposed comet sources lying just outside the orbit of Pluto; however it hasn’t had enough ice, or any possible “Oort Cloud” to supply it with for many years. Scientist believe the comets in our solar system are the last of any comets we will ever see again, according to this discrepancy in the solar system. Due to this scientific knowledge, the earth has only seen a few hundred comets with an average life of ten-thousand years This does not even come close to 4.5 billion years. (Steidl pp.…
In fact, they have a really weird formation cycle. According to "Snow day!" snowflakes in the sky are just dust or dirt. As they fall, they take different shapes. A snowflake can contain up to 200 ice crystals. They are formed when water vapor freezes. The closer it gets to freezing, the heavier the snow. But, if the temperature is below 15…
The article summarized below is from THE NATIONAL GEOGRAPHIC (issue Dec.97) by William R. Newcott. It tells about how comets are important and their effect on earth and its people.<br><br>Comets are leftover scrubs of material that did not make it to planethood in the events creating our solar system. They orbit in a perpetual Deepfreeze until some subtle gravitational nudge upsets the delicate balance. The Great Falls begins. First a snowball drifts towards the sun and steadily accelerates. As solar radiation heats the comets the ice within sublimates, escaping as gas from vents from the surface. Sometimes jets of sublimating ice whirl off the rotating comet nucleus like a firework pinwheel. Dust trapped in the ice breaks free. Pushed back by the pressure of the sun's radiation, the dust streams out behind the comet in what appears as a fairytale. The comet is among the fastest thing in the solar system.<br><br>The most important new results are that the comet contains carbon compounds with trace of nitrogen sodium and sulfur. These ingredients are essential for life on earth. That is why scientist believes that a comet might have crushed on earth and from that moment life began. The ion tales are believed to be a kind of wind sock for the solar wind and NASA scientists are hoping to use it to get weather reports from distant solar system.<br><br>Most comets can be only seen with a telescope but every once in a while an impressive one is visible to the naked eye. People through out history gave importance to comets. For example the Romans made a coin about a comet orbiting the sun that shows how its tail points away from the sun. The Babylonians recorded a comet sighting. One of the Astic leaders gave up his land to the Spanish upon seeing a comet.<br><br>Definitely we are living in the age of comets where scientists detect it through telescopes and e-mail it to the central bureau for Astronomical Telegrams in Cambridge Massachusetts USA. Some people even cheat…
crystals. Ice crystals form with dust and dirt in the air. These ice crystals are…