scholarly journals First Observations of SN 1604 (Kepler’s Supernova)

Universe ◽  
2021 ◽  
Vol 7 (11) ◽  
pp. 430
Author(s):  
Alessandro de de Angelis ◽  
Selenia Broccio
Keyword(s):  
Milky Way ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Optical Observations ◽  
Naked Eye ◽  
The Earth ◽  
Cosmic Ray Acceleration ◽  
History Of ◽  
Recorded Data ◽  
The Subject

A supernova close enough to the Earth is a spectacular event: it can appear as a “new star” as luminous as Venus, or even more, visible for several days. The rate of Galactic supernovae is expected to be of about one in 30 years, with a fraction visible to the naked eye; however in all the history of human civilization only seven supernovae in the Milky Way have been reported, the last two (1572 and 1604) during Galilei’s life. The supernova of 1604, today called Kepler’s Supernova, was observed by Galilei, Kepler and other astronomers in Europe, Korea, China, Arabia. Like the supernova SN1572, today called Tycho’s supernova, it has been the subject of extensive studies, and inspired observational measurements and philosophical considerations on the nature of the heavens. The remnant of SN1604 has been indicated by recent X- and gamma-ray data to be a likely site of cosmic ray acceleration. The first recorded data of optical observations, together with new data, can still tell us a lot about the early evolution of this supernova.

scholarly journals First Observations of SN 1604 (Kepler's Supernova)

2021 ◽  
Author(s):  
Alessandro De Angelis ◽  
selenia broccio
Keyword(s):  
Milky Way ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Optical Observations ◽  
Naked Eye ◽  
The Earth ◽  
Cosmic Ray Acceleration ◽  
History Of ◽  
Recorded Data ◽  
The Subject

A supernova close enough to the Earth is a spectacular event: it can appear as a \new star" as luminous as Venus, or even more, visible for several days. The rate of Galactic supernovae is expected to be of about one in 30 years, with a fraction visible at naked eye; however in all the history of human civilization only seven supernovae in the Milky Way have been reported, the last two (1572 and 1604) during Galilei's life. The supernova of 1604, today called Kepler's Supernova, was observed by Galilei, Kepler and other astronomers in Europe, Korea, and China. Like the supernova SN1572, today called Tycho's supernova, it has been the subject of extensive studies, and inspired observational measurements and philosophical considerations on the nature of the heavens. The remnant of SN1604 has been indicated by recent X- and gamma-ray data to be a likely site of cosmic ray acceleration. The first recorded data of optical observations, together with new data, can still tell us a lot about the early evolution of this supernova.

Influence of supernovae, gamma-ray bursts, solar flares, and cosmic rays on the terrestrial environment

2008 ◽  
Author(s):  
Arnon Dar
Keyword(s):  
Solar Activity ◽  
Cosmic Rays ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Gamma Ray Bursts ◽  
The Sun ◽  
Terrestrial Environment ◽  
The Earth ◽  
The Galaxy ◽  
Threat To Life

Changes in the solar neighbourhood due to the motion of the sun in the Galaxy, solar evolution, and Galactic stellar evolution influence the terrestrial environment and expose life on the Earth to cosmic hazards. Such cosmic hazards include impact of near-Earth objects (NEOs), global climatic changes due to variations in solar activity and exposure of the Earth to very large fluxes of radiations and cosmic rays from Galactic supernova (SN) explosions and gamma-ray bursts (GRBs). Such cosmic hazards are of low probability, but their influence on the terrestrial environment and their catastrophic consequences, as evident from geological records, justify their detailed study, and the development of rational strategies, which may minimize their threat to life and to the survival of the human race on this planet. In this chapter I shall concentrate on threats to life from increased levels of radiation and cosmic ray (CR) flux that reach the atmosphere as a result of (1) changes in solar luminosity, (2) changes in the solar environment owing to the motion of the sun around the Galactic centre and in particular, owing to its passage through the spiral arms of the Galaxy, (3) the oscillatory displacement of the solar system perpendicular to the Galactic plane, (4) solar activity, (5) Galactic SN explosions, (6) GRBs, and (7) cosmic ray bursts (CRBs). The credibility of various cosmic threats will be tested by examining whether such events could have caused some of the major mass extinctions that took place on planet Earth and were documented relatively well in the geological records of the past 500 million years (Myr). A credible claim of a global threat to life from a change in global irradiation must first demonstrate that the anticipated change is larger than the periodical changes in irradiation caused by the motions of the Earth, to which terrestrial life has adjusted itself. Most of the energy of the sun is radiated in the visible range. The atmosphere is highly transparent to this visible light but is very opaque to almost all other bands of the electromagnetic spectrum except radio waves, whose production by the sun is rather small.

scholarly journals XIII. On the precession of a viscous spheroid, and on the remote history of the Earth

1879 ◽  
Vol 170 ◽  
pp. 447-538 ◽  
Keyword(s):  
Relative Motion ◽  
Mass Motion ◽  
The Sun ◽  
The Earth ◽  
Bodily Tides ◽  
History Of ◽  
The Subject ◽  
Theoretical Dynamics

The following paper contains the investigation of the mass-motion of viscous and imperfectly elastic spheroids, as modified by a relative motion of their parts, produced in them by the attraction of external disturbing bodies; it must be regarded as the continuation of my previous paper, where the theory of the bodily tides of such spheroids was given. The problem is one of theoretical dynamics, but the subject is so large and complex, th at I thought it best, in the first instance, to guide the direction of the speculation by considerations of applicability to the case of the earth, as disturbed by the sun and moon.

The History of the Earth in the hallways

2020 ◽  
Author(s):  
Paloma Ramírez Vongrejova ◽  
María José Massé Rodríguez
Keyword(s):  
School Students ◽  
Learning Groups ◽  
Geologic Time ◽  
The Earth ◽  
Experience Teaching ◽  
Widespread Agreement ◽  
Geologic Time Scale ◽  
History Of ◽  
The Subject ◽  
Research Period

<p><span>There is widespread agreement among my fellow colleagues who teach Geology that the History of our planet is a tough topic for teenagers. Unfortunately, not only is the subject considered boring but also useless by the majority of our school students.</span></p><p><span>Our experience teaching these contents in a traditional way has shown us that pupils vaguely remember anything. In order to give a different approach to this issue and, therefore, to promote meaningful learning, we have designed a project where students must be fully engaged.</span></p><p><span>First, the class was organized in cooperative learning groups, so they had to collaborate to complete the task. Then, they started the research period using laptop computers available in the school. Students now dealt with specific vocabulary such as the geologic time scale terms but also a variety of events that occurred from the very first moments, from the formation of the Earth itself to the development of the big reptiles that have always fascinated children and adults, especially their dramatic extinction.</span></p><p> <span><span>Once the topic was developed in detail, they were required to make a poster on scale with the information collected. It was undeniable that pictures or photographs must cover most of the poster as long as short sentences describing both biological and geological phenomena. What we were also concerned about their learning was to improve their creativity. Because of this, they were encouraged to make their own drawings.</span></span></p><p><span>Students really liked the activity, built stronger relationships between them and the final products were so amazing that were exhibited in the walls of the hallways outside their classroom.</span></p><p><span>All these events have been recorded in the rocks so geologists could unfold part of the mysteries of our History. Our teenagers discovered them an represented them for us to enjoy.</span></p>

Teaching the History of Geology

1993 ◽  
Vol 12 (2) ◽  
pp. 234-242
Author(s):  
David Leveson
Keyword(s):  
Low Cost ◽  
Brooklyn College ◽  
Original Writings ◽  
The Earth ◽  
History Of Geology ◽  
Current Belief ◽  
History Of ◽  
The Subject ◽  
Undergraduate Science ◽  
Sophisticated Technology

The content and form of a course in the history of geology are dictated by the nature of the subject matter, the conceived purpose of the course, the background of the instructor and the students who participate, and the availability of appropriate readings. In an undergraduate course just offered by the Brooklyn College Geology Department, half the class were geology majors, half non-science majors. The stated aim of the course was epistemological: a consideration of how one comes to believe something. Investigation was pursued through a comparison of different historiographic accounts of major ideas, episodes and figures in the history of geology: the age of the earth; the meaning of fossils; 17th and 18th C ‘theories of the earth’; the denudation dilemma; the basalt and granite controversies; directionalism; Lyell's ‘uniformitarianism’; fluvialism, diluvialism, and glacialism. Where possible, original writings were consulted; the recent advent of a low cost reprint of Lyell's "Principles" was particularly fortunate. Inevitably, the methods, boundaries, controls, and workings of science were questioned, as was the meaning of ‘truth.’ The history of geology is a particularly useful tool for such an epistemological investigation because, prior to its mid-19th C professionalization, geology was relatively free of arcane jargon or sophisticated technology; thus, it is accessible to students with minimal scientific background. The students came to appreciate the relative character of knowledge and the probable evanescence of current belief. As for myself, trained as a geologist, I came to respect the insights and problems of historians, philosophers and sociologists, and to appreciate the pitfalls and opportunities of teaching in an area beyond one's expertise. Going out on a limb, I suggest that a course in the history of geology could serve well as partially fulfilling undergraduate science requirements.

scholarly journals Menelaah Perkembangan Kajian Hisab Rukyah di Indonesia

ELFALAKY ◽  
2019 ◽  
Vol 3 (2) ◽  
Author(s):  
Heri Zulhadi
Keyword(s):  
The Moon ◽  
Start Time ◽  
Naked Eye ◽  
The Earth ◽  
Modern Period ◽  
History Of ◽  
New Moon ◽  
Calculation System

Abstract Hisab and rukyah are two methods of study used by Muslims to determine the start time of prayer, fasting, hajj and so forth. Periodesasi hisab rukyah, at a glance must have imagined what is meant by hisab rukyah. In the discourse about the Hijri calendar known by the term hisab and rukyah. Hisab is a calendar calculation system based on the average circulation of the moon that surrounds the earth and is conventionally defined. This reckoning system began since the establishment of Caliph Umar ibn Khattab ra (17H) as a reference for composing an enduring Islamic calendar. Another opinion says that this calendar system started in 16 H or 18 H, but the more popular is the year 17 H. While Rukyah is seeing the hilal directly with the naked eye or with the help of tools such as telescopes or other tools that support to see the new moon every end of Qamariyah month. The word rukyah is more famous as rukyatul hilalyaitu see moon. In this study, the author will describe a little about the history of hisab and rukyah in the period of prophets, companions, tabi'in, mid to modern period today. In this study, the scope of hisab rukya includes prayer times, Qibla direction, the beginning of Qamariyah month, eclipse and hijri calendar. Keyword: Hisab, Rukyah.

scholarly journals The Evidences of the Geological Age and Human Manufacture of the Fossil Flint Implements

The Geologist ◽  
1861 ◽  
Vol 4 (1) ◽  
pp. 19-31
Keyword(s):  
British Museum ◽  
The Earth ◽  
Geological Age ◽  
History Of ◽  
The Subject

Amiens and Abbeville do not, however, enjoy a monopoly in these flint implements; they are found, apparently, all over the earth. At any rate, we can boast in our land of such treasures, and we can proudly record that the first discovered specimens belong to England. Let Amiens and Abbeville by all means be commemorated as the scenes of M. Boucher de Perthes' persevering investigations, which have furnished the incitement to the present remarkable inquiry—let the names of Boucher de Perthes, Prestwich, Falconer, Flower, and Evans, be duly honoured as the pioneers of the investigation; but let us also think of Hoxne, Grays, Ilford, Maidstone, Stanway, and the scores of other places where mammalian bones have been found in our own land—and, let us hope that our young geologists will set to work, and reap a rich harvest in the yet ungarnered fields. Does not this first recorded implement—this earliest discovered relic—(fig. 5) treasured and preserved in the Sloane collection, the nucleus of the British Museum, and entered in that old catalogue, two hundred years ago—encourage them. Does it not say in unmistakable language “Under your feet these relies may be found?”There is another of these spear-shaped flints, which has obtained a great deal of notoriety in the late discussions. It was found at Hoxne, in Suffolk—a place memorable in the history of the good king Edmund, the saint and martyr—and was described, and figured in the “Archæologia,” (see cut 9, p. 20), by Mr. Frere, the finder, who, with remarkable acuteness, seems to have fully comprehended the value and true bearing of his discovery. His paper is, even now, an excellent epitome of the subject; and we give it at length, just as it was read in 1797, before the Society of Antiquaries of London.

scholarly journals II. On the Classification of the Cretaceous Beds

1865 ◽  
Vol 2 (11) ◽  
pp. 197-199 ◽  
Author(s):  
Robert A. C. Godwin-Austen
Keyword(s):  
The Past ◽  
The Earth ◽  
History Of ◽  
The Subject ◽  
Geological Formations ◽  
Geological Magazine

The two Memoirs by Dr. Reynès, on the Cretaceous formation, which were noticed in the ninth number of the Geological Magazine, suggest two questions: how far subdivisions there proposed are applicable to the Cretaceous series of this country; and, next, as to the sufficiency of the ground on which the synchronism of the subdivisions of geological formations has been based. The subject of the second Memoir, ‘De l'Étage,’ involves considerations which might be well extended to the whole range of the geological series: indeed, it will hardly be profitable to make much progress with the past physical history of the earth until rules for determining geological horizons shall be established.

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