... systems in the habitable zone, in orbit where temperatures would be beneficial for life. But so far, they have not found an Earth sized planet in the habitable zone of another star. In recent years, there has been much discussion in astronomy circles over the search for extraterrestrial life, ... to all cellular life. Due to anthropogenic climate change, and other variable factors, it is unsure exactly when human life will cease to exist on planet Earth. After completing a 200 million dollar study, NASA reported that a colony could be dug several feet below the moon's surface to protect...

• Word Count: 1498
• Approx Pages: 6
• Has Bibliography
• Grade Level: Undergraduate

... difference lies in human experience upon Earth. The Earth did not seem to be moving, and there was no theory that could account for the relatively stable structure of the planet as it revolved around the sun and about an invisible point. Ptolemy's theory seemed logically valid in light of human experience and Copernicus' model was useful for calculations, so both ... planets also circle the sun, and that the earth precesses on its axis as it rotates. The Copernican theory retained many features of the cosmology it replaced, "including the solid, planet-bearing spheres, and the finite ou...

• Word Count: 1299
• Approx Pages: 5
• Grade Level: Undergraduate

... Venus Multiprobe. The primary purpose of these spacecraft were to accomplish the global mapping of Venus including clouds, atmosphere and ionosphere, and solar wind-ionosphere interaction; and mapping of the planet's surface by radar (1). Of the thirteen Pioneer Space Program satellites, Pioneer 10 and 11 are the most visibly noted in the program for their accomplishments. Through extensive travel and extreme ... through the Asteroid Belt and, the spacecraft closed to within 81,000 miles of Jupiter. In its passing of Jupiter, Pioneer 10 gathered the first close-up images of the planet w...

• Word Count: 1093
• Approx Pages: 4
• Has Bibliography
• Grade Level: Undergraduate

The poisoning of the Earth's ozone layer is increasingly attracting worldwide concern for the global environment and the health effects of life on the Planet Earth. There is not just one particular cause for the ozone's depletion; the accumulation of different pollutants into our ozone layer has all added up and equaled a worldwide problem. There ... the Earth's surface, in a part of the Earth's atmosphere called the stratosphere is very beneficial. The ozone is a major factor that makes life possible on Earth. About 90% of the planet's ozone is in the ozone layer. Ozone in this layer shield...

• Word Count: 2176
• Approx Pages: 9
• Has Bibliography
• Grade Level: Undergraduate

... climate change negotiations has been the emission of greenhouse gasses, particularly carbon dioxide, into the atmosphere. Without these greenhouse gasses, such as ozone, carbon dioxide, water vapor and methane, our planet would be much colder than it is today. (Cunningham, 2000) During pre-industrial times, levels of greenhouse gasses fluctuated because of so-called "natural- events. For example, prior to the ... . Anthropogenic causes of global climate change are not limited to changes in the levels of greenhouse gasses in the atmosphere. Industrial emissions of sulfur dioxide actually ...

• Word Count: 1540
• Approx Pages: 6
• Has Bibliography
• Grade Level: Undergraduate

The poisoning of the Earth's ozone layer is increasingly attracting worldwide concern for the global environment and the health effects of life on the Planet Earth. There is not just one particular cause for the ozone's depletion; the accumulation of different pollutants into our ozone layer has all added up and equaled a worldwide problem. There ... the Earth's surface, in a part of the Earth's atmosphere called the stratosphere is very beneficial. The ozone is a major factor that makes life possible on Earth. About 90% of the planet's ozone is in the ozone layer. Ozone in this layer shield...

• Word Count: 2237
• Approx Pages: 9
• Has Bibliography
• Grade Level: Undergraduate

... the air that would harm your family, your plants, or your pets. You live at home and therefore you take care of your home environment. You also live on this planet, and it should be taken care of just like home, because it will impact on future generations where your children, grandchildren, and so on, will grow and live in their ... that would enable civillians to afford ozone safe technologies, civilians should eliminate the use of ozone depleting chemicals, and the population as a whole should make a collective effort to restore our planet....

• Word Count: 721
• Approx Pages: 3
• Grade Level: Undergraduate

... by saying something about NASA, astronauts, rockets and large space shuttles. Enthusiasts might reference science fiction novels in which propulsion drives easily lift huge spaceships from earth or some distant planet's surface to outer space. The more extreme person might say something about Starwars, Star Trek or any other science fiction movie, quoting the hyper-drive this or quantum flux generator ... ...

• Word Count: 529
• Approx Pages: 2
• Has Bibliography
• Grade Level: Undergraduate

... retrograde motion of the stars and planets. Then Nicholaus Copernicus came up with his theory of a Heliocentric Universe were the sun was the center of the universe instead of the planet earth and all the planets rotate around the sun including earth. Even today we still believe Copernicus's model to be true that our universe consists of planets evolving around the ... ...

• Word Count: 326
• Approx Pages: 1
• Grade Level: Undergraduate