Pluto — An enduringly interesting celestial object

Pluto is a celestial object that had caught the imagination of increasingly ‘sky-aware’ people all around the world, perhaps due to the inspiring story of its discovery by a young amateur astronomer. It was celebrated as the ninth planet of the solar system for decades. A question mark hung over its nomenclature as a planet from the time of the discovery of its moon Charon, when a good estimate of its very small mass in comparison with other planets was obtained. The discovery of UB 313, a body in the outer regions of the solar system that was more massive than Pluto, magnified this question mark and compelled the International Astronomical Union to review the definition of the word ‘Planet’. A new and physical definition was given to this word and Pluto was categorized as a dwarf planet. The beauty of this physical definition of a planet is something that would definitely have been appreciated by Clyde Tombaugh — who once made this beautifully simple statement about Pluto, while its status was being questioned — “It is there, whatever it is”. Yes, whatever it is, Pluto is one celestial object that is somehow very endearing to everyone around the world and is also an object whose studies are compelling certain paradigm shifts in our understanding of the structure and evolution of the solar system. N Rathnasree is the Director, Nehru Planetarium, New Delhi. She is deeply interested in archeo-astronomical field work related to the history of astronomy in India. She is currently working towards a complete observational calibration of the masonry astronomical instruments of the Jantar Mantar observatories at Delhi and Jaipur. Anurag Garg is working as Educator at the Nehru Planetarium New Delhi. He has a very keen interest in observational astronomy as well as theoretical astrophysics.     

北魏天文学成就初探

北魏政权对汉文化采取积极吸收方针,设置天文机构,重视人才的选拔与使用,积极收集、整理天文资料,兴建天文台,制造天文仪器,因此,北魏的天文学取得了长足的进展.其中浑仪、李兰秤漏、天象厅成为天文学史上的重要事件,对中国天文学的发展起了积极的作用.     

Techniques in X-ray astronomy

X-ray astronomy has benefited enormously with the deployment of imaging X-ray telescopes in space, leading to a veritable revolution. Such telescopes require distortion free focusing of X-rays and the use of position sensitive X-ray detectors. In this article I shall describe the importance of X-ray imaging, the optical principles behind the creation of images and the instruments based on these principles. The various techniques used to fabricate such X-ray telescopes are described briefly. The many types of detectors used in X-ray astronomy will be described in the second part of this article in a subsequent issue ofResonance. Kulinder Pal Singh is in the Department of Astronomy and Astrophysics of the Tata Institute of Fundamental Research, Mumbai. His primary fields of research are X-ray studies of hot plasmas in stars, supernova remnants, galaxies, intergalactic medium in clusters of galaxies, active galactic nuclei, cataclysmic variables and X-ray binaries. He is leading the development of a soft X-ray imaging telescope for the ASTROSAT mission to be launched by India in 2007–2008.     

MicroObservatory Net: A Network of Automated Remote Telescopes Dedicated to Educational Use

Many students have a deep interest in astronomy, but a limited opportunity to use telescopes to explore the heavens. The MicroObservatory Network of automated telescopes is designed to provide access to classroom teachers who wish their students to conduct projects over the World Wide Web. The intuitive interface makes it easy for even 10-year-olds to take pictures. Telescopes can be remotely pointed and focused: filters, field of view, and exposure times can be changed easily. Images are archived at the website, along with sample challenges and a user bulletin board, all of which encourage collaboration among schools. Wide geographic separation of instruments provides access to distant night skies during local daytime. Since first light in 1995, we have learned much about remote troubleshooting, designing for unattended use, and for acquiring the kinds of images that students desire. This network can be scaled up from its present capability of 240,000 images each year to provide telescope access for all US students with an interest in astronomy. Our WWW address is http://mo-www.harvard.edu/MicroObservatory/     

《格致新报》及其天地之学传播

重新整理《格致新报》传播的天文学和地理学知识,为研究19世纪末中国科学传播史提供新的文献线索。研究结果给出了:涉及天文学、地理学知识篇目共68篇,占全部期刊946篇的7.1%,其中以日心地动说、新行星的发现、经纬度测量等较为先进,同时对潮汐的成因及北极探险亦作出详细介绍。结论认为《格致新报》中天地之学内容的传播,虽然比较零散,但对中国民众的科学启蒙具有重要的意义。     

Measuring the Heavens to Rule the Territory: Filipe Folque and the Teaching of Astronomy at the Lisbon Polytechnic School and the Modernization of the State Apparatus in Nineteenth Century Portugal

This paper focuses on the astronomy teaching at the Lisbon Polytechnic School and its role in building a modern technoscientific state in Portugal during the nineteenth century. It examines particularly the case of Filipe Folque, who taught astronomy and geodesy at the Lisbon Polytechnic from 1837 to 1856, and played a pivotal role in the geodetic survey carried out in the second half of the nineteenth century. As director of the Portuguese Geodetic and Topographical Office, Folque delineated in detail the plan to proceed with the geodetic survey, a plan which involved a significant number of his former students at the Lisbon Polytechnic. Yet, Folque’s influence went beyond the geodetic achievement. Folque contributed decisively for shaping the character of astronomy and of the astronomical community in Portugal. In a period in which spherical astronomy raised to the status of an autonomous discipline, Folque became one of the most outstanding proponents of this discipline in Portugal. He conceived a course on spherical astronomy at the Lisbon Polytechnic and published an influential textbook to be adopted as a didactic tool in astronomical classes. By doing so, Folque took active part in a nineteenth century culture of textbooks production, and positively influenced the consolidation and shaping of astronomy as a discipline.     

Popularization of Astronomy: From Models of the Cosmos to Stargazing

“Raritäten- und Wunderkammern” of the Baroque period were a microscopic image of the macroscopic world, in which astronomical instruments, orreries and celestial globes played an important role. The Gottorf globe in the ducal castle in Schleswig (1664) and, much later, the Atwood sphere in Chicago (1913) allowed demonstration of star rising and setting for several people sitting inside. An improved version of this idea, a more sophisticated device, was the projection planetarium, invented by Zeiss of Jena and inaugurated in 1925 in Munich. The “Urania” had already opened in Berlin in 1888, showing the real sky from a public observatory, as well as giving theatrical performances about the origin and evolution of the universe. And, since 1909, visitors to Berlin’s Archenhold Observatory have enjoyed stargazing with its impressive “20-m-long” refractor. All these models and instruments were successfully used for the public understanding of science and astronomy, and always created a strong attraction.     

Promoting mental model building in astronomy education

While astronomy has recently re-emerged in many science curricula, there remain unresolved teaching and learning difficulties peculiar to astronomy education. This paper argues that mental model building, the core process in astronomy itself, should be reflected in astronomy education. Also, this crucial skill may promote a better understanding of the nature of science by pupils and it resonates with current understandings about pupils' learning in science. However, three practical questions to be considered are: the expressed reservations about the connection between mental model building and meaningful learning; the earliest age of pupils for whom mental model building is appropriate; and the lack of research into pupils' prior ideas about the role of models in science. The paper describes how a four-phase general pedagogical strategy was adopted to create an astronomy teaching and learning package to promote mental model building. The package consists of notes explaining the mental model building followed by an overview of the teaching-learning approach and suggested outlines of the 12 lessons. Research investigated whether that package can help Year 7-8 pupils interrogate and refine their mental models of the Sun-Earth-Moon system within the constraints of an ordinary class of 33 pupils. The results showed that all four phases of the general strategy were necessary and effective in that most pupils were able successively and successfully to critique their mental models of the Sun-Earth-Moon system while also achieving traditional astronomy knowledge goals. Implications are that pupils as young as Year 7-8 may be able to construct other appropriate mental models, such as those for biological populations, atomic structure and plate tectonics.     

Radio Astronomy: A Strong Link Between Undergraduate Education and Research

The program at the MIT Haystack Observatory has added a new opportunity for students as part of our overall national effort to encourage research by undergraduates. Radio astronomy complements other branches of astronomy, augments science education broadly, and serves to promote interdisciplinary research and education. In the past 2 years, we have conducted a successful pilot program to develop and test a program that facilitates the linking of undergraduate research and education through radio astronomy. As a result of this effort, a small radio telescope has been developed and can be used as a hands-on introduction to radio astronomical techniques and instrument calibration. The telescope is presently being commercialized so that it can be purchased as a low-cost kit for assembly. Remote access to the Haystack 37-m antenna has made it possible for students nationwide to access a research grade facility and we invite faculty everywhere who are interested in this possibility to use our facility. Undergraduate students can participate in the exciting world of research by performing experiments with the telescope. Radio astronomy materials for faculty, students, and interested amateurs have been developed are posted on our web site (http://www.haystack.mit.edu). The materials will continue to be upgraded and enhanced, and the contributions from participating teachers and students nationwide will be added to the project files. We hope to make this not only a resource for someone using our facility but also for the community in general.We are now bringing the Haystack telescopes and radio astronomy to the broad undergraduate community. Based on our pilot experiences, we envision students everywhere being able to exploit the opportunity to strengthen their education through practical research using radio astronomy.     

中国古代对行星视运动规律的认识

五星动态表是中国古代天文学家计算行星位置所必需的基本表格,其精密与否取决于天文学家对行星在一个会合周期中视运动规律的掌握程度。至迟从战国开始,天文学家通过对行星视运动的长期观测,逐渐掌握了行星的顺逆、迟疾和留等规律,并对造成这些现象的原因进行了深入的思考。梳理了西方近代天文学传入中国之前,中国古代天文学家对行星视运动规律的认识进程,这有助于我们审视行星运动理论的历史。     

The Vibrating Universe: Astronomy for the Deaf

The Deaf have often been overlooked when designing informal STEM education and public outreach activities. Astronomers at UC Riverside and teachers at the California School for the Deaf, Riverside (CSDR), have designed an astronomy workshop aimed specifically for the Deaf using the school’s on-site sound lab. We have used astronomy for this workshop because the field has a significant edge over other sciences to act as portal for K-12 engagement in science given the imagery it presents, the answers it offers to grand questions, and its interdisciplinary nature. The workshop is an unconventional activity that excites the students and provides a positive experience in astronomy, based on knowledge that they already acquired beforehand in the classroom. Our workshop uses electromagnetic emissions, enhanced sounds and sonification processes of cosmic phenomena that have low frequencies and sufficiently distinguishable patterns which are delivered to students through a specialized designed sound lab for the Deaf. Storytelling paired with videos and images are used to give understandable meaning to the sounds of the Universe. Positive feedback was collected from over 80 students who participated in our workshop. Our activity can be reproduced elsewhere to further engage the Deaf community in science.

     

Transit of venus: Quantitative observing with simple equipment

The possibilities of quantitative student observations during the transit of Venus, using simple equipment, are discussed. The equipment could also be used for safe observations of the Sun during eclipses, transits of Mercury as also for daily observations of sunspots. The annual variation in the angular diameter of the Sun as it passes from aphelion to perihelion and so on, could be measured with this simple equipment. School and college astronomy clubs would find it very useful to use this equipment for daytime astronomy activities and learning-oriented projects.     

The Effectiveness of Internet-Controlled Astronomical Research Instrumentation for Education

Over the last decade, remote instruments have become widely used in astronomy. Educational applications are more recent. This paper describes a program to bring radio astronomy into the undergraduate classroom through the use of a remote research-grade radio telescope, the MIT Haystack Observatory 37 m telescope. We examine the effectiveness of such remote access in the classroom. The remote use of the large telescope has opened up a research facility for undergraduate students. The experience has been largely successful with over 150 students from about 20 colleges using the telescope every year. The student experiments have included classroom demonstrations by faculty, and short-term laboratory experiments and long-term research experiments performed by students. Although a visit to the site provided students with a sense of the scale of the antenna, operating on a purely remote basis still gave the students a rewarding research and learning experience. The effectiveness of the remote instrument is judged mainly by the student presentations and papers that have been generated, by the enthusiasm of the faculty to continue using the facility as part of their curricula, and through a survey of students and faculty.     

Development and Validation of the Star Properties Concept Inventory

Concept inventories (CIs)—typically multiple-choice instruments that focus on a single or small subset of closely related topics—have been used in science education for more than a decade. This paper describes the development and validation of a new CI for astronomy, the Star Properties Concept Inventory (SPCI). Questions cover the areas of stellar properties (focussing primarily on mass, temperature, luminosity, and lifetime), nuclear fusion, and star formation. Distracters were developed from known alternative conceptions and reasoning difficulties commonly held by students. The SPCI was tested through an iterative process where different testing formats (open-ended, multiple-choice?+?explain, and multiple-choice) were compared to ensure that the distracters were in fact the most common among the testing population. Content validity was established through expert reviews by 26 astronomy instructors. The SPCI Version 3 was then tested in multiple introductory undergraduate astronomy courses for non-science majors. Post-test scores (out of 23 possible) were significantly greater (M?=?11.8, SD?=?3.87) than the pre-test scores (M?=?7.09, SD?=?2.73). The low post-test score—only 51.3%—could indicate a need for changing instructional strategies on the topics of stars and star formation.     

Constructing Narratives of Continuity and Change: A transdisciplinary approach to researching lives

In outlining the framework offered at the UNESCO Regional Conference in support of Global Literacy (New Delhi, November 2007), it was pointed out that concepts of poverty, sustainable development and particularly of literacy and innovation have themselves been in continuous re‐construction. An analysis of the context and condition for literacy policies and initiatives in Bangladesh—a country with one of the highest rates of both poverty and illiteracy—was undertaken, as an exemplar for other countries of the Asian region, and for Third World countries around the globe. It is suggested that to meet the challenge ahead, social‐structural strategies must be joined with instructional strategies and second socializations of all involved; and both the planners and providers of adult literacy, and the intended beneficiaries of adult literacy dispensation must be mobilized. Commitments must last for a decade—and more if necessary.     

Evaluating tertiary teaching: A New Zealand perspective

The purpose of this research was to test the applicability of two American instruments designed to assess tertiary students' evaluations of teaching effectiveness with New Zealand students. The scales were found to have high internal consistency reliability coefficients, most of the items were seen to be appropriate, and every item was considered of importance by at least some of the students. In addition, all but the Workload/Difficulty items clearly differentiated between “good,” “average,” and “poor” lectures. Further analyses generally supported both the factor structure identified in earlier research and the convergent and discriminate validity of the scales from both instruments. This research has provided strong support for the applicability of these American instruments for evaluating effective teaching at a New Zealand university.     

Great experiments in physics

In 1965, Arno Penzias and Robert Wilson of Bell Telephone Laboratories in USA discovered weak microwave radiation coming from all directions which was soon realised to be a relic from a hot dense early phase of our Universe—the ‘big bang’. This article focuses on the key experimental techniques and innovations which made this momentous—and accidental!—discovery possible. Amit Roy is at the Nuclear Science Centre, New Delhi, building a superconducting linac booster for the pelletron accelerator. He spent over two decades at the Tata Institute of Fundamental Research, Mumbai investigating nuclei using accelerators and probing symmetries in physics. His hobbies are books and music.     

宇宙物质探索现状

介绍了当今物理宇宙学和天文学在探索宇宙物质成份过程中所遇到的解释正反物质不对称的起源以及澄清占宇宙物质成份95％以上的暗物质与暗能量的本质的难题．并指出了这一严峻的挑战很可能会给物理学带来一场革命。