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Westbrook, Minnesota
July 13, 2011     Sentinel Tribune
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July 13, 2011

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]]]II[II!IIII!IIIIIIELIUJIIlIIIlIIIIlIiIgliItlIIIIilIIiliIIIIIJLE J lllilllImlllJlJlll L I! IIILLI  !tlH L/I i[llk:/li/1! 1 !l[ll Dill LI'JlLIIIIil SENTINEL TRIBUNE I [ AREA Focus I I I I Wednesday, July 13, 2011 Page 8 SAALO FARMS HORSE CAMP Last week Jeri Brown worked with three to six year old yot)th riders, teach- ing them how to care for and ride horses. Left: Jeri assisted Ethan Larson of Westbrook. Right: Macey Christians of Westbrook did not need help mounting the pony. PLUM CREEK RENDEZ00/OUS Above left: This black powder shooter tried his luck shooting from the Iron Horse last Saturday at the Plum Creek Rendezvous, at the Plum Creek Ranch southwest of Walnut Grove. Above: This shooter decked out in pioneer attire walked to the firing line. Above: Colonel Dave Doubler watched as shooters took their shots at the targets Saturday afternoon. Right: Leonard McLaughlin manned the reg- istration table for the afternoon shoot. Neekly clence l:gcUla sZClark WR-104 Eight thousand light years from the Earth, in the con- stellation Sagittarius, lurks a massive binary-star system that is on the verge of becom- ing a supernova. The star is call Wolf-Rayet 104 and, like Sagittarius the archer, this star could be taking aim at us. If it finds its mark, it could hit us with enough deadly radiation to destroy our pro- tective ozone layer. This would cause drastic climate change that could trigger a mass extinction. Wolf-Rayet stars, named after the two astronomers who discovered them first, are massive, hot, and very luminous. They are about 25 times more massive than our Sun, and 100,000 times more luminous. Super massive stars like WR-104 live fast and bum their nuclear fuel very quickly, within tens of millions of years. Compare that to the age of our Sun which is 4.6 billion years. As they exhaust their supply of nuclear fuel, they undergo gravitational collapse into a black hole, releasing a mas- sive blast of high-energy radiation--a gamma ray burst so powerful that it would briefly outshine an entire galaxy. Gamma rays are the deadliest, most ener- getic type of radiation. Energy from the explosion is beamed into two narrow, oppositely directed jets. Because WR-104 is a binary star system it produc- es a spiral-patterned stream of dust and charged particles as the stars orbit each other. As the star collapses, it becomes a dense, flattened, rapidly-rotating disc and the gamma rays are ejected along the rotational axis poles, rushing out like soda from a pop can that had been shaken before opening. If the poles of the collapsing star happen to be pointed at us--look out. And because astronomers can see the spiral of this star full on it means that the star's rotational axis is pointed in our general direction, as if Sagittarius's arrow were pointed right at us. But don't worry too much, the time line for such an event is anytime in the next 100,000 years. Also, recent evidence suggests that it is pointing slightly away from us and will miss its mark. 1) True or false: WR-104 is named after the constella- tion is was found in. 2) WR-104 is __ times more massive than our Sun. 3) True or false: Beams of energy are ejected from the rotational poles of a super- nova. 4) WR-104 can be found in which constellation? 5) WR-104 displays a spi- ral pattern because it is a __ star. a) super mas- sive b) rotating binary c) super hot d) super luminous Answers on page 7 Copyright (C) 2011 Weekly Science Quiz All rights reserved. CLASSIFIED ADS WORK FOR YOU See a photo in the Sentinel Tribune you like? Now you can order it and other photos not printed, quick and easy on line... This blue button on our website links YOU to all of our PICTURES You can have photos from recent newspapers printed pro- fessionally. Select pictures from albums including many that were not printed in the newspaper. These photos are avail- able to you through easy online purchase. To order your photos go to (New Century Press Home Page) click on Sentinel Tvibtme L Sentinel Tribune Photo Mugs, posters and T-shirts are also available. CLASSIFIED ADS SMALL PRICE BIG RESULTS r----------------,i sIO0 OFF' I WATERWORKS All Basement I * n  Waterproofing Bame t Sysms I I Foundation Repair. Coupon good 'til August 31, 2011. Not valid with any other promotions or discounts, I l m aim emil m Eli m imm I m m m aim I m gI Small school Unique courses Responsive teachers 1.800.764.8166 x 111 Sentinel Tribune available at: Oleson's Mercantile Hoyt Oil & Convenience Bubai Grocery Thrifty White Pharmacy Maynards Grocery ExpressWay Shady Drive Inn