Physical Processes in the Solar System

2017 ◽  
pp. 714-736
Keyword(s):  
Solar System ◽  
Physical Processes

scholarly journals Planet forming disks, debris disks and the Solar System

2019 ◽  
Vol 15 (S350) ◽  
pp. 207-215
Author(s):  
Inga Kamp
Keyword(s):  
Chemical Composition ◽  
Solar System ◽  
Planetary Systems ◽  
Theoretical Work ◽  
Structure Evolution ◽  
Debris Disks ◽  
Physical Processes ◽  
Disk Structure ◽  
Open Questions ◽  
Evolution Modeling

AbstractVLT instruments and ALMA with their high spatial resolution have revolutionized in the past five years our view and understanding of how disks turn into planetary systems. This talk will briefly outline our current understanding of the physical processes occurring and chemical composition evolving as these disks turn into debris disks and eventually planetary systems like our own solar system. I will especially focus on the synergy between disk structure/evolution modeling and astrochemical laboratory/theoretical work to highlight the most recent advances, and open questions such as (1) how much of the chemical composition in disks is inherited from molecular clouds, (2) the relevance of snowlines for planet formation, and (3) what is the origin of the gas in debris disks and what can we learn from it. For each of the three, I will outline briefly how the combination of theory/lab astrochemistry, astrophysical models and observations are required to advance our understanding.

A search for ‘frozen optical messages’ from extraterrestrial civilizations

2002 ◽  
Vol 1 (1) ◽  
pp. 71-73 ◽  
Author(s):  
R. Weinberger ◽  
H. Hartl
Keyword(s):  
Solar System ◽  
The Other ◽  
Physical Processes ◽  
High Quality ◽  
Sky Surveys ◽  
Systematic Examination ◽  
Other Hand ◽  
Celestial Bodies ◽  
The One

For a quarter of a century we have been engaged in a systematic examination of high-quality photographic (optical) sky surveys in the search for new celestial bodies of various kinds. It took about 5000 hours to cover the whole northern celestial hemisphere and half of the southern one. In total, about 12000 new objects were discovered. From the very beginning of our programme we also searched for objects (or groupings of them) of rather peculiar morphology. The motivation was to detect objects revealing exceptional physical processes, on the one hand, but also to discover constructions possibly created by advanced extraterrestrial civilizations (ETCs), on the other hand. A number of very peculiar objects were indeed found (these were mostly studied in detail later), but none of these appeared likely to be the product of alien masterminds. We may conclude that at least within about 10000–20000 light-years around the Solar system no highly advanced ETCs intend to reveal themselves through such objects.

scholarly journals An Overview of Comet Composition

2011 ◽  
Vol 7 (S280) ◽  
pp. 261-274 ◽  
Author(s):  
Dominique Bockelée-Morvan
Keyword(s):  
Solar System ◽  
Molecular Cloud ◽  
Solar Nebula ◽  
Short Review ◽  
Present Knowledge ◽  
Physical Processes ◽  
Solar System Formation ◽  
System Formation ◽  
Early Phases

AbstractComets are made of ices, organics and minerals that record the chemistry of the outer regions of the primitive solar nebula where they agglomerated 4.6 Gyr ago. Compositional analyses of comets can provide important clues on the chemical and physical processes that occurred in the early phases of Solar System formation, and possibly in the natal molecular cloud that predated the formation of the solar nebula. This paper presents a short review of our present knowledge of the composition of comets. Implications for the origin of cometary materials are discussed.

scholarly journals Galaxies and Their Nuclei

1974 ◽  
Vol 3 ◽  
pp. 51-66
Author(s):  
V. A. Ambartsumian
Keyword(s):  
Solar System ◽  
General Theory ◽  
Scientific Revolution ◽  
General Assembly ◽  
Correct Interpretation ◽  
Physical Processes ◽  
The Moment ◽  
Nicolaus Copernicus ◽  
The Universe ◽  
Modern Form

Our Extraordinary General Assembly is devoted to the memory of one of the greatest men of science to the genial Polish astronomer - Nicolaus Copernicus. The main service of Copernicus which has made his name immortal was in finding the correct interpretation of the planetary motions we observe. Instead of geocentric notions, which proved unable to explain the accumulated bulk of empirical data on the apparent motions of planets he has put forward and advocated the notion of a solar system thus presenting the true picture of the part of the Universe we live in. The scientific revolution started by him was continued by Galileo and Kepler and was crowned with the great theoretical generalizations of Newton. As a result a foundation has been created for the most exact theories of motions in the solar system which were developed during the next centuries. These theories in their modern form give also the possibility to solve all the problems concerning the orbital motions of spaceships.At this stage we can not yet boast that in the study of nuclei of galaxies and their activity we have reached the level which existed in planetary astronomy even before the works of Newton. Only 15 years elapsed from the moment when the idea of activity of nuclei of galaxies was clearly formulated (Ambartsumian, 1958). During these years discoveries of the greatest importance have been made. New unexpected discoveries occur almost each year. These discoveries influence decisively our notions on the diversity of objects and phenomena in the distant space, but they are still insufficient for the construction of adequate theories. In order to penetrate into the very nature of nuclear phenomena we require new observations, new measurements and new data. And if some optimists imagine that the time has already ripen to build a general theory of these phenomena, the more cautious astronomers would like to consider a more or less satisfactory systematization of observational data concerning the activity of nuclei and the understanding of external physical processes accompanying it as a tremendous success.

scholarly journals Comet composition and Lab

2015 ◽  
Vol 11 (A29A) ◽  
pp. 321-324
Author(s):  
Dominique Bockelée-Morvan ◽  
Nicolas Biver
Keyword(s):  
Data Analysis ◽  
Solar System ◽  
Planetary Systems ◽  
Present Knowledge ◽  
Laboratory Studies ◽  
Early Solar System ◽  
Physical Processes ◽  
Star Forming ◽  
Star Forming Regions

AbstractComet composition and properties provide information on chemical and physical processes that occurred in the early Solar system, 4.6 Gyr ago. The study of comets and of star-forming regions both help for a better understanding of the formation of planetary systems. A review of our present knowledge of cometary composition is presented. We also discuss laboratory studies that would be helpful for data analysis.

scholarly journals The flux of interstellar particles detected in the Solar System

2008 ◽  
Vol 4 (S251) ◽  
pp. 345-346
Author(s):  
Mária Hajduková
Keyword(s):  
Solar System ◽  
Data Center ◽  
Mass Scale ◽  
Physical Processes ◽  
Different Populations ◽  
Significant Change ◽  
Observational Techniques ◽  
Meteor Data

AbstractThe present work shows the proportion of interstellar meteors from different mass ranges (exceeding 20 orders of mass scale) detected by various observational techniques. Having analysed the IAU Meteor Data Center, we find that the mass index of interstellar particles continuously increases towards higher masses, but there is a significant change between 10−10 − 10−11 kg. This break is possibly caused by different physical processes leading to different populations of interstellar particles and might be connected with their origin.

Physical Processes Affecting the Motion of Small Bodies in the Solar System and their Application to the Evolution of Meteor Streams

1983 ◽  
Vol 74 ◽  
pp. 83-87
Author(s):  
Iwan P. Williams
Keyword(s):  
Solar System ◽  
Observational Data ◽  
Radiation Pressure ◽  
Small Particles ◽  
Physical Processes ◽  
Meteor Stream ◽  
Small Bodies ◽  
Meteor Streams ◽  
Physical Effects ◽  
New Particles

AbstractIn addition to planetary perturbations, the small particles which make up a meteor stream are subject to outward radiation pressure and the Poynting-Robertson effect. New particles can also be generated in a stream through being released from the nucleus of a comet. We summarise the main physical effects, discuss models for meteor stream evolution and give a brief account of the observational data available.

The Origin of the Moon

1962 ◽  
Vol 14 ◽  
pp. 149-155 ◽  
Author(s):  
E. L. Ruskol
Keyword(s):  
Chemical Composition ◽  
Solar System ◽  
The Moon ◽  
The Earth ◽  
The Difference ◽  
Origin Of The Moon

The difference between average densities of the Moon and Earth was interpreted in the preceding report by Professor H. Urey as indicating a difference in their chemical composition. Therefore, Urey assumes the Moon's formation to have taken place far away from the Earth, under conditions differing substantially from the conditions of Earth's formation. In such a case, the Earth should have captured the Moon. As is admitted by Professor Urey himself, such a capture is a very improbable event. In addition, an assumption that the “lunar” dimensions were representative of protoplanetary bodies in the entire solar system encounters great difficulties.

The Origin of the Moon and its Relationship to the Origin of the Solar System

1962 ◽  
Vol 14 ◽  
pp. 133-148 ◽  
Author(s):  
Harold C. Urey
Keyword(s):  
Solar System ◽  
The Moon ◽  
The Past ◽  
The Earth ◽  
Short Period ◽  
Origin Of The Moon

During the last 10 years, the writer has presented evidence indicating that the Moon was captured by the Earth and that the large collisions with its surface occurred within a surprisingly short period of time. These observations have been a continuous preoccupation during the past years and some explanation that seemed physically possible and reasonably probable has been sought.

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