Today, 1 December 2006, is World AIDS Day. The first case was documented twenty-five years ago, in 1981. Since then, 25 million people have died and 40 million people today are infected with HIV (the virus that causes AIDS). Worldwide, 11,000 people contract HIV every day. In the United States alone, over 1.1 million people are infected with HIV, and almost a quarter of them don’t know it. AIDS affects people of all races, genders, and sexualities. While sub-Saharan Africa is affected the most, AIDS is now a worldwide pandemic. At the very least, please take this day to educate yourself and others on HIV/AIDS and what you can do to protect yourself and others. HIV is preventable, but ignorance and prejudice hamper efforts to control the disease.
HIV (the human immunodeficiency virus) is the virus that causes AIDS. It is transmitted via bodily fluids such as blood, pre-ejaculate and semen, vaginal fluids, and breast milk. The most common ways that HIV is spread are through sexual intercourse, by sharing needles used to inject drugs, and from mother to child (during pregnancy, birth, or breast feeding).
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The hunt for the missing Mars Global Surveyor continues
Mars Global Surveyor has been orbiting Mars since 1997, the first of a fleet of probes now exploring the Red Planet. Well past its intended lifespan, it has provided a wealth of data, but unfortunately went silent several weeks ago, and so far neither Earth nor the other probes have been able to detect or contact it. This is a good opportunity to take a brief look at the many craft busy examining our neighbor in space. There are too many to cover in a single post; subsequent posts will continue the series. In the meantime, you may read the New Scientist article discussing the search for Mars Global Surveyor.
Artist’s concept of MGS orbiting Mars. Artwork Credit: Corby Waste. Courtesy NASA/JPL-Caltech.
Mars Global Surveyor
The Mars Global Surveyor (MGS) was launched by NASA on 7 November 1996; it reached Mars eight months later on 11 September 1997. It was the first U.S. craft to visit Mars in twenty years (the Soviet Union’s Phobos 2 briefly explored Mars in 1998 before prematurely malfunctioning; the United States’ Mars Observer, launched in 1992, failed to function properly). MGS has performed well beyond expectations; it completed its primary mission in 2001 and has had its mission extended several times since then. It has been a highly successful spacecraft, studying Mars extensively and providing more information than all previous missions combined, according to New Scientist. Some of its observations include mapping local magnetic fields (Mars, unlike Earth, does not have a global magnetic field) and discovering repeating weather patterns. And more recently, it had been serving as a communications relay for the other craft exploring the planet, while complementing their observations.
Continue reading “Exploring Mars, Part 1: Mars Global Surveyor“