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Old backpack was losing a shoulder strap and after 11 years its water resiliency had reached absolute zero.
College dictionaries line a shelf at the new Textbook Rental Service building on the Eastern Illinois University campus Monday, Aug. 9, 2010, in Charleston, Ill. (Stephen Haas)
G11.2-0.3 is a circularly symmetric supernova remnant that contains a dense, rotating dead star at its center, representing a textbook case of what the remnant of an exploding star should look like after a couple thousand years. When a massive star collapses, the outer layers of the star are blown away in an extremely energetic explosion. Depending on the mass of the original star, a dense object such as a neutron star or a black hole, can form and be left behind at the explosion's center. Such a neutron star, known as a "pulsar" when it rapidly rotates, can be kicked by the thermonuclear shock wave created when the star exploded, causing it to race through space at millions of miles per hour.
By combining X-ray and radio observations, astronomers have evidence that G11.2-0.3 is likely the result of the explosive death of such a massive star, perhaps witnessed in 386 A.D. Radio observations measure the remnant's expansion rate, which, in turn, can be used to calculate how long ago the star exploded. The radio data is consistent with association of the supernova remnant with the "guest star" reported by Chinese astronomers nearly 2,000 years ago. Chandra's ability to pinpoint the pulsar at nearly the very center of G11.2-0.3 also supports the idea that this debris field could have been created around the time of the Chinese observations. Surprisingly, the age of the pulsar determined from the X-ray and radio data differs from the standard pulsar age estimate, usually determined from how fast it is spinning. In this case, the so-called spin parameters suggest the G11.2-0.3 is 10 times older than the remnant age. This argues strongly that young pulsar spin ages can be very misleading and should be considered with caution.
In Chandra's X-ray image, the pulsar and a cigar-shaped cloud of energetic particles, known as a pulsar wind nebula, are predominantly seen as high-energy X-rays (blue). A shell of heated gas from the outer layers of the exploded star surrounds the pulsar and the pulsar wind nebular and emits lower-energy X-rays (represented in green and red).
Credit: NASA / CXC / Eureka Scientific / M.Roberts et al.
Momka Peeva literally wrote the book on glass, published in Bulgaria in 1993 and still used as a primary text there:
[Translation]
Authors:
Joanna Pavlova PhD
Momka Peeva
Emil Popov PhD
Technology of Glass
Textbook for Ceramics and Glass Technical College
Technika
Matthew Toner looks for a book's location at the new Textbook Rental Service building on the Eastern Illinois University campus Monday, Aug. 9, 2010, in Charleston, Ill. (Stephen Haas)
This is an old textbook for HomeEc classes. It's in mint condition other than a little yellowing from age! Can't wait to read this one tonight!
This is an essential book to learning Japanese. It is one of many texts
that can be studied to improve ones vocabulary, Kanji, or grammar. Having
many resources available to you I believe is important for secondary
language acquisition. I would like to explore English textbooks that
Japanese students use.
Northwest students pick up their textbooks at The Station Aug. 28, 2015. Textbooks and laptops are included as part of Northwest students' tuition, saving them about $7,200 over four years. (Jacob Hubbert | Northwest Missouri State University)
Bookshelves are seen at the new Textbook Rental Service building on the Eastern Illinois University campus Monday, Aug. 9, 2010, in Charleston, Ill. (Stephen Haas)
Scarborough Pirates are held up by the Leeds Akkies defence during a Group One game in amateur rugby league's Yorkshire Men's League. The visiting Pirates, 12-8 up at half-time, won 34-22 at Old Modernians Sports & Social Club, Cookridge, Leeds.
Matthew Toner returns books to their locations at the new Textbook Rental Service building on the Eastern Illinois University campus Monday, Aug. 9, 2010, in Charleston, Ill. (Stephen Haas)