The Salina Journal from Salina, Kansas on May 17, 1998 · Page 49
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The Salina Journal from Salina, Kansas · Page 49

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Sunday, May 17, 1998
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Page 49
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THE CHURCH Ever Loving - Everlasting Now the growth, change and crucial turning points in Church history are revealed in a concise pamphlet. --—FREE!- Maa c ° u p° n Toda y ! —USA* Please send me a free pamphlet entitled The Catholic Pilgrimage #29 This offer Is limited to one free pamphlet. Name: Address:. City: State: .Zip:. Mail To: Catholic Information Service • Knights Of Columbus PO Box 1444, New Haven CT 06506-1444 THE KNIGHTS OF COLUMBUS PROTECTING FAMILIES FOR GENERATIONS'" Play The Harmonica In One Easy Lesson... YOU GET ALL THIS FOR ONLY $Q95 9 J) Genuine Hohner Harmonica ^Instructional Cassette (30 Min.) J> Beginner's Songbook I f you've always wanted the enjoyment and satisfaction of playing a musical instrument, our exclusive "FAST LEARNING SYSTEM" will TEACH you to play the harmonica in just one easy lesson! You'll receive a world-famous HOHNER HARMONICA plus everything you need to play popular blues, coun- try and western, rock and pop — even if you've never played a musical instrument before! This incredibly easy "Fast Learning System" works for everyone... young and old alike. The secret? Our simple "play by numbers" system and exclusive HEAR N*PLAY audio BEGINNER'S TAPE that's filled with basic tips, techniques, and simple instructions you can hear and then follow—for "tuneful" results! Soon you'll be playing your new HOHNER HARMONICA at parties and family gatherings! Give yourself an exciting, brand- new talent by placing your order today! American Family® 100% Satisfaction Guaranteed If not lolally delighted, you may return your purchase for a prompt refund of your purchase price - no questions asked! HOW TO ORDER To order the HOHNER HARMONICA KIT (NZ7), send your name, address, zip code and check for $9.95 plus $3.95 p&h each to: American Family* Box 4110, Dept. NZ70-UJ Huntington Station, NY 11746 SAVE! Order two for only $17.95 plus $3.95 p&h. Be sure to indicate quantity and total amount enclosed. CA and NY residents add appropriate sales tax. 119M NaUaal Smdlalloni Inc Gonnl Oflka; 880 South Itmrth Pint, CtaMl lillp. Iff \\nt-Wl SCIENCE Black holes: Hubble sheds light The roving telescope focuses on the "weirdest things in the universe." BY JAMES TREFIL A NEWLY RELEASED image from the Hubble Space Telescope gives a dramatic view of the galaxy Centaurus A: curtains of stars, dust and gas belts. But it's what can't be seen that makes Centaurus A, at a relatively close 10 million light-years away, such a noteworthy neighbor. At the galaxy's heart is a massive, violently active black hole — the first such phenomenon found in a galaxy so near our own. And Hubble scientists are studying it with a state-of-the-art infrared camera (see inset) that cuts through cosmic dust. Hubble's piercing view gives scientists an exceptional chance to learn about black holes, arguably the weirdest things in the universe. "PITCH" BLACK: A BASEBALL ANALOGY To explain what a black hole is: Let's say a pitcher can throw a fastball that moves at 100 miles per hour. If he threw the ball straight up, it would climb about 300 feet before the Earth's gravity could pull it back. If that pitcher could throw the ball at 7 miles per second (about 25,000 mph), it would never stop, but sail off into space. Now suppose we could somehow crunch the Earth down so that its radius was half of what it is now. Because our pitcher would be closer to the dense, compacted Earth's center, he would have to throw the ball even harder to get it away. If we kept crunching until the Earth was less than an inch across, Albert Einstein's Theory of General Relativity tells us that nothing — not the fastest baseball, not even a beam of light — could get away from the gravitational pull of that tiny Earth. At that point, the pitcher would be inside a black hole. A black hole, hi other words, is a part of the universe where matter has become so compacted that nothing can ever get away from its gravity; anything that goes in never comes out. The name comes from the fact that an object that absorbs all the light that falls on it, reflecting nothing, will appear black. EINSTEIN SAW IT COMING The existence of black holes was predicted in 1916, soon after Einstein's theory was published, but they were regarded as something of a theoretical oddity, something that couldn't possibly exist in the real world. All this changed in the early Meet James Tref il James Trefil, USA WEEKEND'S new contributing editor, literally wrote the book on 1,001 Things Everyone Should Know About Science - plus two dozen more books. Trefil "surpasses almost all other scientists writing about science for the public," says The New York Times. He has earned top honors from the American Association for the Advancement of Science, writes for Smithsonian magazine and does commentary on National Public Radio. A professor at Virginia's George Mason University, Trefil is helping redesign Chicago's Adler Planetarium. Starting with this issue, he'll report on the day's top science stories. 1O USA WEEKEND • May 16-17,1998 1980s when astronomers looking at the center of our Milky Way galaxy saw evidence of swirling clouds of gas circling some invisible massive body. Eventually, they came to realize that our own galaxy had a black hole at its center. Those astronomers had to look at the center of the Milky Way with radio receivers, rather than ordinary telescopes, because the central plane of our spiral galaxy is filled with dust and gas. This absorbs the visible light and obscures the galaxy's center to our eyes (and our optical telescopes), but it's transparent to radio waves. Astronomers soon found black holes at the center of other galaxies, too. Most were like ours: relatively sedate bodies surrounded by swirling gases and stars. Centaurus A, however, seemed different. Also called NGC 5128 (because it's the 5,128th object listed in astronomy's New Galactic Catalogue of celestial objects), it appeared to be a galaxy in turmoil. Astronomers believe it recently collided with, and probably swallowed, a small spiral galaxy like our own. Unfortunately, dust obscures NGC 5128's core so most telescopes couldn't see into it. Enter the Hubble, whose instru- INFRARED CAMERA ments can detect both ordinary light and infrared, an "invisible" form of light you probably use in your TV remote control. A BLACK HOLE DWARFING OUR SUN At the galaxy's center, Hubble's infrared camera detected a black hole whose mass might be as much as 1 billion times that of our sun, with material giving off X-rays as it falls into the black hole. This is what astronomers call an "active" galaxy. Scientists know of other active galaxies with massive black holes at their center. These ancient galaxies may hold the key to understanding the origins of our universe — but at billions of light-years away, they're far too distant to get a good look. Centaurus A gives us the same kmd of weird, chaotic black hole, but relatively close at hand. Now Hubble gives us the hardware to study it in detail, d Starring with Hubble...? Soon to join Hubble in space: an observatory to measure cosmic X-rays. To enter NASA's name-the-observatory contest, visit us at www.usaweekend.com. NOW YOU CAN MULTIPLY THESE NUMBERS IN YOUR HE AD 102 X 46 4692 Quick and Easy Tricks for People Who Hate Math F or years successful students have used time-saving tricks to do math easier and faster. Now over one hundred of these techniques are revealed and explained in this concise, remarkably dear compendium. These tricks provide faster and easier ways to add, subtract, multiply, and divide. Fractions and percentages are also covered. Everything to help you get better grades and higher scores on entrance examinations. By using the simple foolproof methods in this book, you can double or triple your calculation speed. Even if you have always hated math. NO SPECIAL MATH ABILITY IS NECESSARY There are no complicated formulas or unfamiliar terms, no long drills or exercises. For each problem the author provides an explanation of the method and a step-by-step solution. Then the short-cut is applied with a proof and explanation of why it works. ANYONE CAN USE IT Students, teachers, business people, accountants, bank tellers, check-out clerks, anyone who uses numbers and wishes to increase his or her speed and arithmetical agility can benefit from the dear easy-to-follow techniques given here. SHOKl-Jp u MATH -ALSOAVAILABLE- MATHEMAT1CS FOR THE NON-MATHEMATICIAN, by award-winning professor Morris Kline, is an excellent reference and self-study course for people with no expertise beyond high school math. Step-by-step explanations of algebra, geometry, trigonometry, introductory calculus and much more. Exercises (with answers) test your understanding. You may return for a full refund if not right for your level of study and ability. Over 641 pages! Order both and save! USA WEEKEND • May 16-17, 1098 11 Publishers Choice® 100% Satisfaction Guaranteed If not totally delighted, you may return your purchase for a prompt refund of your purchase price — no questions asked! [Publishers" Ch~oiceVBox~4123, b'ept BS95-UA, ; Huntington Station, NY 11746 j Please rush me: i BS95 Short Cut Math Only $4.95 plus $2.50 p&h ' DD42 Mathematics for the Non-Mathematidan ! Only $12.95 plus $2.50 p&h i SAVE! Order both for only $16.90 plus $4.50 p&h. ! My check is enclosed for $ . CA and NY residents add sales tax. Charge my DVISA* D MASTERCARD* D DISCOVER* DAMEX* i ! Card No. L i Name j Address. I City . Exp. Dale_ State Zip. I ClWfebonlSywMtanihc. GaimlOfllcM: 580 South BoenAPlKt Central Up, N\117a-MI5

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