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020			_a081510717
040			_aPAGASA-DOST _cJHCSC
082			_a520 Ar768 1996
100	1		_aArny, Thomas T. _eauthor.
245	0	0	_aExplorations: _ban introduction to astronomy / _cby Arny T. Thomas
250			_a1996 version
260			_aSt. Louis, Missouri: _bMosby, _cc1996.
300			_axxiii, 519 pages; _bfigures and tables, illustration.
504			_aIncludes appendixes, glossary and index
504			_aIncludes bibliographical references and index.
520	3		_aThis new 1996 version of Explorations: an Introduction to Astronomy incorporates significant new discoveries as well as numerous minor revisions. Because this 1996 version retains the same layout and pagination as its predecessor, I couldn't make extensive changes. However, I have added new pictures (including a number from the repaired Hubble Space Telescope) and described important new results, although it has not been easy to pick among the many exciting discoveries of the last 2 years. Two astronomical events, however, seem to me to stand out. The first is the measurements of the Hubble constant of 75 km/s/Mpc (deduced from observations of Virgo cluster galaxies both from the ground and from the Hubble Space Telescope). This value leads (with standard, critical density, cosmological models) to an age for the Universe that conflicts with the age of globular clusters. Thus, I have added a brief discussion of how this discrepancy might be resolved. The other big event I have chosen to add is the collsion of Comet Shoemaker-Levy with Jupiter, even though the analysis to date reveals nothing very striking. In addition to these changes, I've added, where appropriate, more problems and more recent references at the end of the chapters. Color coding of variables in mathematical equations proved to be confusing for some students, so I have removed it from in-text equations. However, I have retained the color coding in figure labels and captions where it is less intrusive and where, I believe, it can be pedagogically useful. Finally, I have tried to clarify a number of points throughout the text. These modifications leave the pagination unchanged, even though 75% of the pages have been altered to some extent. By keeping pagination the same, students who only have access to the 1994 version can still be participate in a class using the updated Explorations 1996 version.
650	0	4	_aAstronomy
650	0	4	_aAstronomy _xexplorations _y1996 _zSt. Louis, Missouri
942			_2ddc _cBOOK
999			_c3081 _d3081