... trigger cells called melanocytes to produce melanin. The brown pigment is melanin which gives the appearance of a tan. Doctor Albert Kilgman, a certified as Ph. D says "rays speed up the aging process of the skin, resulting in the loss of elasticity" (Kligman). UVA rays exist during sunny, cloudy or even rainy days. Tanning ... beds and sun lamps consist ninety three percent to ninety nine percent UVA radiation, this is three times the amount of UVA rays given off ... Sun; this makes the skin become thick, wrinkled and leathery. The most harmful effects caused by UV radiation are skin c...

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• Grade Level: High School

... you have a pillow and you take away everything else in the universe, it is still a pillow. But since time is measured only by the rotation of the earth and the solar system, then if you take everything in the universe away time does not exist. There is nothing to measure it with, ... of the solar system and the planets in it. It is divided up in year, hours, and seconds. But what is a second? How long is it? And who was given the divine power to answer these questions. Albert Einstein said, "If! you could travel at the speed of light then time would stand still." A light- ... year is th...

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... the years went by, and the well-known scientists Isaak Newton and Johannes Kepler were born, the development of the telescope took speed. The precision and shape of the telescopes varied from 5 to 7 feet in length to a 140-feet telescope, and from magnifying of 4 times to a magnifying of about 100 times. Today, however, scientists know significantly more about the outer space then ever, and this ... Optics Space Telescope Axial Replacement). This mission had to be done since scientists found, soon after the launch of HST, an irregularity on its primary mirror. With the help of COSTAR th...

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... one to point a telescope up to the sky for observation. Refracting telescope: Refraction refers to the bending of light when it passes from one medium to another of different density. These telescope use a large lens called an objective lens. The main purpose of the lens is to collect light as possible. The lens has a convex (curved outward) shape making it thicker in the middle than ... 's orbit at which it is closet to the sun. As the planet moves from perihelion to the orbital point called aphelion, its speed decreases. Aphelion is the orbital point of a planet in which it is the fart...

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... consider is, if there had ever been a time when nothing existed then nothing would exist now. It is evident that nothing produces nothing. In light of this, since something exists now, it must follow logically that something has existed forever. As Sproul has remarked: "Indeed, reason demands that if something ... While its outer limits have not been measured, it is estimated to be as much as 20 billion light years in diameter (i.e., the distance it would take light to travel across the Universe at a speed of over 186,000 miles per second). There are an estimated one billion galaxies in t...

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... see. Humans only see a very small part of the entire electromagnetic spectrum. The electromagnetic spectrum includes gamma rays, X-rays, ultraviolet, visible, infrared, microwaves, and radio waves. The difference between these types of radiation is their wavelength and frequency. Wavelength increases and frequency decreases from gamma rays to radio waves. All forms of radiation travel at the speed of light. Infrared radiation lies between the visible and ... microwave sections of the electromagnetic spectrum. Infrared waves have wavelengths longer than visible and shorter than microwave...

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... they give off (Foundations of Astronomy 235). They cannot be seen because of the clouds of dust that block and absorb the light being given off by them. However, what keeps a star from collapsing on itself? The answer is very simple, pressure being produced in the core of the young star. Two factors resist collapse of gas clouds according to Seeds "the speed of the hydrogen atom and ... the turbulence of the hydrogen atom"(Foundations ... of Astronomy 233). The hydrogen atoms in the core act similarly to the ball in a spray paint can the more ... ...

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... , Clark Kent is the one and only Superman. Conceived on the doomed planet Krypton, scientist Jor-El sent his son Kal-El on a hyper light rocket off into space. The tiny rocket landed on earth and was recovered by a Kansas farming couple, Jonathan and Martha Kent. They found the tiny ... have his powers. Using his powers causes Clark to use up his stored yellow sun energy. He can loose his powers if he expends a lot of energy quickly, or if he spends too much time away from the yellow sun while on outer space. Superman's powers include: Strength-Varies depending on ... his energy levels; ...

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... shielding us from cosmic rays (very energetic particles generated far away in the universe) which can cause damage to living cells. The shape of the heliosphere, although never fully observed, is thought to be like a protective bubble encasing the solar system. However, it isn"t symmetrical around ... out into a tail at the back, much like a planetary magnetosphere. Recent data from the Voyager 1 and 2 space probes have shed new light on the subject. Since 1992, fifteen years after their launch for a supposed four-year flight, they have begun picking up intense low-frequency ... of inte...

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... described as "dirty snowballs" because they are icy lumps, or wandering icebergs. Comets are relatively tiny- just a few miles across on average. Their nuclei are very different from glowing balls of light, with multimillion-mile-long tails. This is one reason comets occasionally visit the inner Solar System. Astronomers divide comets into long-period types with orbits ... ionized molecules, including carbon monoxide and dioxide. By action of solar wind, molecules are blown away, forming a thin stream of hot gases continuously ejected from the solar corona. In case you do not know the m...

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... have. These businesses will take on large efforts to help raise the temperature and the amount of oxygen in the atmosphere. Some of these large projects are things like large mirrors orbiting the planet to redirect light in the direction of the planet. Deep holes drilled in the surface of the planet by self-fueling robots, robots that have the capability to fuel them selves ... exist before a large percent of the planet's surface was capable of sustaining human life, someone would have to take a lot of factors into consideration before spending a considerable amount of money on a projec...

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