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National Geographic Readers: Meteors by Melissa Stewart Pdf
Blast off on a trip to discover the fascinating world of meteors. In this image-packed book, kids will learn all about these objects hurtling through space—and into our atmosphere. This level 3 reader is written in an easy-to-grasp style to encourage the scientists and explorers of tomorrow!
Meteors and How to Observe Them by Robert Lunsford Pdf
In this era of high-tech instruments, meteor observing is the one facet of astr- omy that needs nothing more than your naked eye. Meteors can be easily seen without the aid of cameras, binoculars, or telescopes. Just ? nd a comfortable chair and lie back and watch for the surprises that await high above you. It is a great way to involve the family in science where everyone is active at the same time, not wa- ing to take turns at the eyepiece. The kids especially enjoy the hunt for “shooting stars,” oohing and ahing at each streak of light that crosses the sky. While gazing upwards, it is also a great way to get more familiar with the sky by learning the constellations and seeing if you can see the warrior among the stars of Orion or the scorpion among the stars of Scorpius. Until just recently, one could simply go outside and watch for meteors from his or her yard. Unfortunately, humankind’s fear of the dark and the widespread use of lighting as advertisement have lit the nighttime scene in urban areas so that only the brightest stars are visible. Serious meteor observing under such conditions is nearly impossible as the more numerous faint meteors are now lost in the glare of urban skies. Today, a serious meteor observing session entails organizing an outing to a country site where the stars can be seen in all their glory and meteors of all magnitudes can be viewed.
Simultaneous Correction of Velocity and Mass Bias in Photography of Meteors by Cearcy D. Miller Pdf
In any statistical study of characteristics of meteors with data obtained from photographs, corrections must be made for two inherent biasing effects due to the brighter trails left by meteors of greater mass and/or by meteors of greater velocity relative to Earth's atmosphere. In the past, attempts have been made to correct for both biasing effects with a weighting factor inversely proportional to the square of the meteor velocity relative to atmosphere. A new analysis has been made to investigate the magnitude of the weighting factor, specifically for application to photographic meteor data published by Smithsonian Institution Astrophysical Observatory. As a result of this analysis, a revised factor was obtained to operate upon actual counts of photographic meteors within various classes of velocity to provide a correct ratio of counts for all velocities reduced to any given lower mass limit. In the analysis, an expression was derived theoretically for maximum effective exposure on the photographic plate produced by a meteor in terms of the original mass of the particle, its velocity relative to Earth's atmosphere, and the angle of its path to the zenith. The expression for maximum effective exposure was tested and revised by application to 100 test meteors that were believed to have provided approximately uniform effective exposure density. The revised expression for maximum effective exposure was combined with a widely accepted equation for the influx rate of meteors of mass greater than a stated value to obtain approximately the desired weighting factor. The manner of the combination eliminated mass of the meteor particle from the factor. The analysis indicated a large change in value of the exponent of velocity relative to Earth's atmosphere in the weighting factor, namely, from -2 downward at least to -3.85 and possibly as low as -4.22. Application of the new factor should cause a significant reduction of estimates of average meteor velocities relative to the atmosphere. Extensive changes would also be required in estimates of other parameters that might bear a systematic relation to meteor velocities.
Meteorites and the Early Solar System II by Dante S. Lauretta,Harry Y. McSween Pdf
They range in size from microscopic particles to masses of many tons. The geologic diversity of asteroids and other rocky bodies of the solar system are displayed in the enormous variety of textures and mineralogies observed in meteorites. The composition, chemistry, and mineralogy of primitive meteorites collectively provide evidence for a wide variety of chemical and physical processes. This book synthesizes our current understanding of the early solar system, summarizing information about processes that occurred before its formation. It will be valuable as a textbook for graduate education in planetary science and as a reference for meteoriticists and researchers in allied fields worldwide.
Asteroids, Meteorites, and Comets by Linda T. Elkins-Tanton Pdf
Discusses the solar system bodies that are not one of the nine planets or their moons. This volume describes the discoveries of various asteroids, along with the long centuries of argument over the nature of meteorites and impact craters. It is useful for those interested in understanding the science and history of these bodies.
Asteroids, Comets, and Meteorites by Jon Erickson Pdf
Looks at asteroids, comets and meteorites, including what they are, how they are formed, how they have affected the history of Earth, and definitions of related terms.
Month-by-month information on meteor showers and how to make the most of watching them. Advice on starting and building a meteorite collection plus the scientific explanation of what meteors are and where they come from. Includes new information about recent space exploration and studies of meteors.
Report of the ... and ... Meetings of the British Association for the Advancement of Science by British Association for the Advancement of Science. Meeting Pdf
British Association for the Advancement of Science
Author : British Association for the Advancement of Science Publisher : Unknown Page : 844 pages File Size : 53,8 Mb Release : 1870 Category : Science ISBN : UCAL:B3736166
“Egerton tells the story of the dissolution of the Union as it should be told, not from the perspective of those looking back on the crisis, but from the clouded vision of those who lived through it.” -Carol Berkin, author of A Brilliant Solution: Inventing the American Constitution and Civil War Wives In early 1860, pundits across America confidently predicted the election of Illinois senator Stephen A. Douglas in the coming presidential race. Douglas, after all, was a national figure, a renowned orator, and led the only party that bridged North and South. But his Democrats fractured over the issue of slavery, creating a splintered four-way race that opened the door for the upstart Republicans, exclusively Northern, to steal the Oval Office. Dark horse Abraham Lincoln-not the first choice even of his own party-won the presidency with a record-low share of the popular vote. His victory instantly triggered the secession crisis. With a historian's keen insight and a veteran political reporter's eye for detail, Douglas R. Egerton re-creates the cascade of unforeseen events that confounded political bosses, set North and South on the road to disunion, and put not Stephen Douglas but his greatest rival in the White House. Year of Meteors delivers a vibrant cast of characters-from the gifted, flawed Douglas to the Southern “fire-eaters,” who gleefully sabotaged their own party, to the untested Abraham Lincoln-and a breakneck narrative of this most momentous year in American history.
Asteroids, Comets, and Meteors by Mary-Jane Knight Pdf
"Asteroids, comets, and other space rocks rush around the solar system. Learn about these fascinating flying masses and their place in the solar system."