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Essay / How can we avoid asteroids? - 1347
How can we avoid asteroids? In our daily lives, a multitude of forces act on us constantly. A fundamental force is gravity. Gravity (also known as gravitational force) is the force of attraction. Every object in the world that has mass exerts an attractive force, otherwise known as force, on another mass (“Forces of Attraction”). Gravitational pull increases and decreases depending on the amount of mass and proximity of objects. ["Weight, mass and gravity."] [See Fig 1.]. In this way, gravity played an important role in the creation and development of the universe. This brought pieces of matter together to form things like moons, planets, stars, and even large, swirling galaxies. This also causes Earth and all the planets in the solar system to orbit the sun [“What Is Gravity Really? "). However, gravity also causes objects like asteroids to form. Asteroids are small rocky objects that orbit the sun and are primarily located in the asteroid belt between the orbits of Mars and Jupiter ["How Asteroids Work."]. It is widely believed that asteroids are the remnants of the enormous cloud of dust and gas that condensed to create the solar system around 4.5 billion years ago. Their width can range from a few feet to several kilometers [“Asteroids and comets”. ]. An asteroid impact can be extremely devastating [See Fig 2.]. A good example is the one that is believed to have hit the Earth 65 million years ago. It is widely speculated that this asteroid caused so much humidity and dust in the atmosphere that it blocked sunlight, dropping temperatures worldwide and causing the extinction of the dinosaurs [Brian, Marshall. ]. With more than 20,000 asteroids known to man, the pressing question is how can we avoid... middle of paper ... Dangerous asteroids could be the best protection, an expert says. " Space.com. TechMediaNetwork, Inc., May 29, 2013. Web. April 9, 2014. Near-Earth Object Investigation and Deviation Analysis of Alternatives Np: NASA, March 2007. PDF. NASA Gravity Well Digital Image. NASA, nd Web. April 8, 2014. “Planetary Defense: Social, Economic, and Political Implications.” Wayback Machine, June 16, 2006. Web, April 10, 2014. Wall, Mike “How Nuclear Bombs Could Save Earth from Asteroids.” killers.” Space.com. TechMediaNetwork, Inc., February 14, 2014. Web. April 9, 2014. “Weight, Mass and Gravity.” BBC News. BBC, nd Web. April 7, 2014. “What Is Gravity Really?” : NASA's The Space Place. NASA, nd Web. April 7, 2014. Wie, Bong. Architecture of the HAIV mission. Digital image. Space.com. TechMediaNetwork, Inc., nd Web. April 9. 2014.