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Million Years Ago 65 Million Years
2,114 wordsThe "Nemesis Theory" was an outgrowth of the discovery of Alvarez et al. , that the impact of a large (10 km diameter) comet or asteroid was responsible for the great mass extinction that took place 65 million years ago. Studies of the fossil record by Dave Raup and Jack Sepkoski shows that this was not an isolated event, but one of several mass extinctions that appear to occur on a regular 26 million year cycle. Their original paper analyzed marine fossil families, and was published in the Proc...
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Billion Years Ago Solar System
2,233 words... alvarez's case, and see if it was flawed. This job was turning out to be more fun than I had expected. On my second reading of Alvarez's letter, I found it particularly dubious that the Cretaceous and Eocene extinctions should be excluded. How do we know that asteroids do not hit the Earth periodically? I asked. Maybe our failure to arrive at a theory just meant that we hadn't been clever enough. Not finding something is not the same as proving it is not there. I decided to reserve judgment....
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1 And 2 Outer Planets
1,337 words... e accomplished. Telemetry contact was lost on 15 November 1995 at a distance of 106 million km. Future mission planning had included a 23. 6 km / s , 10, 000 km flyby of Comet P/Honda-Makes-Pajdusakova on Feb 3, 1996 (approaching the nucleus along the tail) some 0. 17 AU from the Sun, and a 14 million km passage of Comet P/Giacobini-Zinner on Nov 29, 1998. Suisei (the Japanese name meaning 'Comet') was launched on August 18, 1985 into heliocentric orbit to fly by Comet P/Halley. It is identi...
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Solar System Comets Comet
393 wordsThe article summarized below is from THE NATIONAL GEOGRAPHIC (issue Dec. 97) by William R. Newport. It tells about how comets are important and their effect on earth and its people. Comets are leftover scrubs of material that did not make it to planet hood 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...
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Is Nuclear Power Safe For The Environment
1,475 wordsThere are many controversies about whether nuclear power is really safe for the environment or not. This paper will put all doubt aside and inform the pros and cons of nuclear power to the environment. First look will be at the alternatives in Americas power supplies: coal, natural gas, and oil. They are not environmentally sound, as some people believe. Some countries use nuclear power as a primary source of energy, and almost all countries use nuclear power on some level. Where there is nuclea...
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The Enhanced Green House Effect
1,723 wordsThe Enhanced Greenhouse Effect For the past ten thousand years the earth's climate has been extremely good and beneficial to mankind. Today however, major changes are taking place. Humans beings are changing the face of the entire planet by destroying the rain forests and pumping our pollutants into the air and water. Some of these gases are very toxic and they are destroying our ozone layers which allows life to exist on earth These things are changing the make-up of the earth's biosphere and i...
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Degrees Celsius Solar System
456 wordsMercury is the closest planet to the sun. It's average distance from the sun is approximately fifty-eight million km and it's diameter is 4875 km, making it the second smallest planet in our solar system. It's volume and mass are about 1 / 18 that of the earth and it's average density is approximately equal to that of the earth. Mercury's magnetic field is one-hundred times weaker than that of Earth's. Mercury has the shortest revolution of all the planets in our solar system and revolves around...
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The Mayan And Julian Calendar
813 wordsThe Mayan and Julian Calendar The Mayan calendar, in its full glory, is probably the most complicated calendar based on integer arithmetic that has ever existed. While lunar and lunisolar calendars do exist that are very complex, most of them are based on observation, as in starting a month when the moon is in a particular stage, or on floating point calculations that for all practical purposes simply replace such observation. The Maya did not have algebra, but they had an enormous advantage ove...
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Gas And Dust Nuclear Fusion
991 wordsAn Introduction to World History. "Any scientist, I think, will agree that in a hundred years time, many of the details of the story we tell now may look kind of cute and naive, because well have moved on beyond them. But if you happen to live now, " he concludes, "this is the best story going. " said David Christians and it is really true. We lived in a beautiful world but dont know a lot about cosmology, geology, archeology, and population and environmental studies. Today with the help of Davi...
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Polar Ice Caps Carbon Dioxide
2,528 wordsColony on Mars The human race has always explored the unknown. At the dawn of the humanity new lands were the object of exploration. People stimulated by their curiosity and care for the future generations left their overcrowded or exhausted lands and went to unknown virgin territories in search of fertile soil, economic and political independence and secure life for their children. The technological progress of the twentieth century has changed life of the mankind to such an extent, that in ear...
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Solar Panels Solar Cells
993 wordsSatellites Satellite is probably the most useful invention since the wheel. Satellites have the capability to let you talk with someone across the nation or let you close a business deal through video communication. Almost everything today is heading towards the use of satellites, such as telephones. At&# 038; t has used this communications satellite (top right) ever since the late 1950 s. TVS and radios are also turning to the use of satellites. RCA and Sony have released satellite dishes for R...
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Center Of The Universe Tycho Brahe
1,176 wordsIn modern day astronomy and the study of the universe, individuals usually come up with predictions and then gather information and data in order to prove or disprove their hypothesis. Other astronomers in the history of astronomy did the same and came up with their own conclusions based on the data they collected. Some of their predictions were correct, and some were way off, but for the most part they progressed the study of the universe to the point where society is today. Astronomers such as...
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Solar And Lunar Eclipses Phases Of The Moon Earth
444 wordsTitle: Phases and Eclipses of the Moon Purpose: The purpose of this lab is to demonstrate the different phases of the moon during its revolution around the earth and also to display solar and lunar eclipses. Hypothesis: I think that by following the procedure, I will successfully complete this lab in showing the phases of the moon throughout its revolution and the solar and lunar eclipses because I am moving the moon correctly. Independent variable: Movement of the moon Dependent variable: Phase...
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Electro Magnetic Magnetic Fields
1,480 wordsTechnology and the individual: How Electro- Magnetic Fields Affect our lives Electricity is the building block of our society. Now more and more we are becoming dependent on electricity from computers to microwaves, electric power is what keeps our society running. Something that no one thinks about is Electro- Magnetic Fields or (ELF? s). While these ELF are being ignored slowly they are becoming a silent but deadly killer in our society. Scene cancer and illness are becoming so common people a...
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Electro Magnetic Magnetic Fields
1,441 wordsElectricity is the building block of our society. Now more and more we are becoming dependent on electricity from computers to microwaves, electric power is what keeps our society running. Something that no one thinks about is Electro- Magnetic Fields or (ELF? s). While these ELF are being ignored slowly they are becoming a silent but deadly killer in our society. Scene cancer and illness are becoming so common people are slowly coming around about what ELF? s are and what if anything can be don...
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Solar Panels Fossil Fuel
657 wordsThe first question, which I must ask in order to write this essay, is, what is energy? Energy gives us the ability to do thing. Everything in the world needs a supply of energy, and so energy is used to make things work. The word energy is taken from the Greeks and means the work within and nearly all energy originally came from the sun. The main type of energy used in the world is fossil fuel. Fossil fuels are called non-renewable because they are the remains of plants and small dead animals, w...
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Reduce The Amount Solar Power
338 wordsBased on the current technology regarding power sources we believe that Australia s total power usage should be divided between these four sources using the percentage specified (reasons why are listed below): Nuclear Power 50 % Coal Power 25 % Solar Power 15 % Wind Power 10 % Nuclear Nuclear should generate majority of the power because it is a reliable power source and unlike coal generators, it does not give off harmful emissions. Coal supplies are dwindling however, uranium is abundant in Au...
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Carbon Dioxide Emissions Parts Per Million
2,377 words1. What are the Greenhouse Gases? Carbon dioxide (CO 2) is responsible for more than half the human contribution to the greenhouse effect, and concentrations have climbed steadily from around 280 parts per million at the dawn of the industrial revolution meaning 0. 028 percent of the air s volume is taken up by the gas to around 355 ppm today. As people burn oil, coal and natural gas, they release carbon that ancient plants in past geological ages absorbed and stored. 6 As cement workers process...
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M P H Black Hole
3,742 wordsBlack holes are objects so dense that not even light can escape their gravity, and since nothing can travel faster than light, nothing can escape from inside a black hole. Loosely speaking, a black hole is a region of space that has so much mass concentrated in it that there is no way for a nearby object to escape its gravitational pull. Since our best theory of gravity at the moment is Einsteins general theory of relativity, we have to delve into some results of this theory to understand black ...
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Ancient Egyptians Egyptians Believed
2,840 wordsYou climb the steep stairs of the temple. As you look around, you see the blood of your fellow prisoners pooled on the floor. You see the priests. They are caked with the blood of their former victims. You hear the drums start. They will muffle your screams. The time is 1531. The place is the great Aztec city of Tenochtitlan. You are about to have your heart ripped out of your still living body to appease the angry gods. This is an example of sun worship. In some cultures, the sun was a blood-hu...
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