Nasalover13
Hello,welcome to my page. I am a BIG fan of Nasa, and other space related stuff. I am new to Wikinews. but I plan on uploading some pictures.(not all are space related.)Some of my hobbies include hanging out with friends,reading,and, surfing the web. Here are some of my favorite articles (all from wikinews, or wikipedia.)
STS-119 lands successfully in Florida Image: NASA/Chuck Tintera. The space shuttle Discovery landed at the Kennedy Space Center in Florida on Saturday, ending its thirteen-day mission to the International Space Station (ISS). The spacecraft's landing was delayed for two hours due to low-lying clouds and heavy winds. Discovery had been sent out to the ISS in order to install a new set of solar panels to increase its power supply.
Members of the STS-119 crew pose after landing. L-R: Commander Lee Archambault, Pilot Tony Antonelli and Mission Specialists Joseph Acaba, Steve Swanson, Richard Arnold and John Phillips.
Image: NASA/Kim Shiflett.
“Welcome home, Discovery, after a great mission to bring the International Space Station to full power,” said an astronaut, George Zamka, radioing from the mission control center in Houston, Texas.
NASA tested an experimental tile under the Discovery's left wing during its approach for landing. The tile was almost eight centimetres thick, and had a bump in it, intended to disturb the otherwise smooth airflow over the shuttle's wing, thus exposing it to high amounts of heat. Engineers installed the tile in order to measure the excess heat that was generated on downstream tiles. A military airplane monitored the heat with an infrared camera. The findings will be used to help determine better designs for future shuttles.
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NASA:
The National Aeronautics and Space Administration (NASA, pronounced /ˈnæsə/) is an agency of the United States government, responsible for the nation's public space program. NASA was established on July 29, 1958, by the National Aeronautics and Space Act.[3] In addition to the space program, it is also responsible for long-term civilian and military aerospace research. Since February 2006 NASA's self-described mission statement is to "pioneer the future in space exploration, scientific discovery, and aeronautics research."[4] NASA's motto is: "For the benefit of all".[1] The motto of NASA's Office of Education is: Shaping the Future: Launching New Endeavors to Inspire the Next Generation of Explorers.[5]
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The hertz (symbol: Hz) is a measure of frequency per unit of time, or the number of cycles per second. It is the basic unit of frequency in the International System of Units (SI), and is used worldwide in both general-purpose and scientific contexts. Hertz can be used to measure any periodic event; the most common uses for hertz are to describe radio and audio frequencies, more or less sinusoidal contexts in which case a frequency of 1 Hz is equal to one cycle per second. The unit hertz is defined by the International System of Units (SI) such that the hyperfine splitting in the ground state of the caesium 133 atom is exactly 9 192 631 770 hertz, ν (hfs Cs) = 9 192 631 770 Hz.[1] Equivalently, 1 Hz = 1⁄9,192,631,770 ν (hfs Cs). This definition is derived from the SI definition of the second. Hertz are inverse seconds, s-1. In practice, the hertz simply replaced the older cycle per second. In English, hertz is used as both singular and plural. As any SI unit, Hz can be prefixed; commonly used multiples are kHz (kilohertz, 103 Hz), MHz (megahertz, 106 Hz), GHz (gigahertz, 109 Hz) and THz (terahertz, 1012 Hz). One hertz simply means "one cycle per second" (typically that which is being counted is a complete cycle); 100 Hz means "one hundred cycles per second", and so on. The unit may be applied to any periodic event—for example, a clock might be said to tick at 1 Hz, or a human heart might be said to beat at 1.2 Hz. Neither the cycle per second nor the hertz, however, are regularly used in nonsinusoidal contexts. The "frequency" (activity) of aperiodic or stochastic events, especially radioactive decay, is expressed in becquerels. To avoid confusion, periodically varying angles are typically not expressed in hertz, but rather in an appropriate angular unit such as radians per second. A disc rotating at 60 revolutions per minute (RPM) can thus be said to be rotating at ≈6.283 rad/s or 1 Hz, where the latter reflects the number of complete revolutions per second. The conversion between a frequency f measured in hertz and an angular frequency ω measured in radians/s are: ω = 2πf and . This SI unit is named after Heinrich Hertz. As with every SI unit whose name is derived from the proper name of a person, the first letter of its symbol is uppercase (Hz). When an SI unit is spelled out in English, it should always begin with a lowercase letter (hertz), except where any word would be capitalized, such as at the beginning of a sentence or in capitalized material such as a title. Note that "degree Celsius" conforms to this rule because the "d" is lowercase. —Based on The International System of Units, section 5.2.
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Cool sites:
http://upload.wikimedia.org/wikipedia/commons/0/04/GM_headquarters_in_Detroit.JP