scholarly journals Correction to: Interiors of Earth-like planets and satellites of the Solar System

2022 ◽  
Author(s):  
Doris Breuer ◽  
Tilman Spohn ◽  
Tim Van Hoolst ◽  
Wim van Westrenen ◽  
Sabine Stanley ◽  
...  
Keyword(s):  
Solar System ◽  
Planets And Satellites ◽  
Earth Like Planets

scholarly journals Chances for Earth-Like Planets and Life Around Metal-Poor Stars

2004 ◽  
Vol 213 ◽  
pp. 45-50
Author(s):  
Hans Zinnecker
Keyword(s):  
Solar System ◽  
Early Universe ◽  
Galactic Halo ◽  
Magellanic Clouds ◽  
Heavy Elements ◽  
Terrestrial Planets ◽  
Lower Mass ◽  
Solar Metallicity ◽  
Earth Like Planets ◽  
The Universe

We discuss the difficulties of forming earth-like planets in metal-poor environments, such as those prevailing in the Galactic halo (Pop II), the Magellanic Clouds, and the early universe. We suggest that, with fewer heavy elements available, terrestrial planets will be smaller size and lower mass than in our solar system (solar metallicity). Such planets may not be able to sustain life as we know it. Therefore, the chances of very old lifeforms in the universe are slim, and a threshold metallicty (90% solar?) may exist for life to originate on large enough earth-like planets.

scholarly journals The Motions of Uranus' Satellites: Theory and Application

1979 ◽  
Vol 81 ◽  
pp. 177-180
Author(s):  
Richard Greenberg
Keyword(s):  
Solar System ◽  
Physical Properties ◽  
Celestial Mechanics ◽  
Dynamical Theory ◽  
System Study ◽  
Broad Application ◽  
Origin And Evolution ◽  
Structure And Dynamics ◽  
Principal Source ◽  
Planets And Satellites

As spacecraft and sophisticated ground-based observations measure physical properties of many planets and satellites, dynamical theory and astrometry remain a principal source of such knowledge of the Uranian system. Study of the motions of Uranus' satellites thus has broad application to planetary studies as well as to celestial mechanics. Moreover, the structure and dynamics of the system provide important cosmogonical constraints; any theory of solar system origin and evolution must account for the formation within it of analogous systems of regular satellites.

Atmospheres as a clue to the early Solar System

1988 ◽  
Vol 325 (1587) ◽  
pp. 569-582 ◽  
Keyword(s):  
Solar System ◽  
Observational Data ◽  
Terrestrial Planets ◽  
The Sun ◽  
Early Solar System ◽  
Secondary Formation ◽  
Planets And Satellites

Conditions that could have applied in the environments of the major planets when they were forming make it possible that the present icy mantles of the larger satellites were then oceans and vapour atmospheres encasing silicate—ferrous cores. The major constituents are explored by comparison with the present atmospheres of the terrestrial planets. It is further suggested that the primary condensations during the formation of the Solar System were the Sun and the major planets, and that the terrestrial planets and satellites were a secondary formation. Some observational data are offered in support of the arguments and future tests are suggested.

Habitable zone for Earth-like planets in the solar system

2000 ◽  
Vol 48 (11) ◽  
pp. 1099-1105 ◽  
Author(s):  
S Franck ◽  
A Block ◽  
W von Bloh ◽  
C Bounama ◽  
H.-J Schellnhuber ◽  
...  
Keyword(s):  
Solar System ◽  
Habitable Zone ◽  
Earth Like Planets

scholarly journals Possible Features of IAU Standards

1992 ◽  
Vol 9 ◽  
pp. 155-159
Author(s):  
P. K. Seidelmann
Keyword(s):  
Solar System ◽  
Internal Consistency ◽  
Working Group ◽  
The Past ◽  
Cartographic Coordinates ◽  
Planets And Satellites ◽  
Standard Values ◽  
Best Estimates

In the past, the IAU has adopted standard values for some constants, primarily for use with solar system ephemerides. The constants adopted in 1976 were specifically adjusted to provide internal consistency. In each case, when constants have been adopted, the changes have reflected accuracy improvements, and the purpose has been to encourage the accomplishment of better science.Over the past 12 years, the Working Group on Cartographic Coordinates has issued triennial reports giving the best values for the sizes and rotations for the planets and satellites. This working group now is an IAU/IAG/COSPAR working group reflecting the different organizations that have recognized the benefits of this group. This is an example of a properly functioning working group, which provides the best values on a regular basis. The IUGG also provides best estimates triennially for values of interest in geodesy and geodynamics.

scholarly journals Distribution of the Mean Motions of Planets and Satellites and the Development of the Solar System

1974 ◽  
Vol 62 ◽  
pp. 23-23
Author(s):  
H. Jehle
Keyword(s):  
Solar System ◽  
Gravitational Interaction ◽  
Statistical Distribution ◽  
Point Of View ◽  
Orbital Elements ◽  
Gas Laws ◽  
History Of ◽  
Planets And Satellites ◽  
The Mean

In this paper the point of view is taken that the distribution of orbital elements in the solar system should be discussed first on a purely gravitational basis, i.e. on the basis of a set of particles entirely under gravitational interaction, before hydromagnetic and other effects are taken in consideration too. One might indeed assume that there has been a time in the history of the solar system from when on hydromagnetic and gas laws ceased to play an important role in comparison to gravity. In the epoch since that time the solar system might have developed from a set of a large number of smaller particles into the present solar system by way of transitions which these particles made to preferential orbital elements, and by accretion. Means had been found to handle the development of this set of particles under gravitational interaction, by defining the set appropriately in terms of a statistical distribution. In considering the problem of the evolution of the solar system, such a gravitational approach, which was encouraged by Einstein, seems the reasonable first step.

scholarly journals Does the energy density of the vacuum influence planetary motions?

1986 ◽  
Vol 114 ◽  
pp. 417-418
Author(s):  
R. Shubert
Keyword(s):  
Energy Density ◽  
Solar System ◽  
Gravitational Force ◽  
Quantum Mechanical ◽  
Planets And Satellites

New cosmological and quantum mechanical evidence for the existence of an ether has made it appropriate to investigate again the effect of such a medium upon the motions of planets and satellites within the solar system. The properties of a medium of this kind are as yet unknown except that it may be the ultimate origin of inertia and therefore that it may have a fundamental link to the gravitational force.

scholarly journals Editorial

2005 ◽  
Vol 4 (1) ◽  
pp. 1-2 ◽  
Author(s):  
Anja C. Anderson ◽  
Axel Brandenburg
Keyword(s):  
Solar System ◽  
Artificial Life ◽  
The Other ◽  
Extreme Conditions ◽  
The Public ◽  
The World ◽  
Earth Like Planets ◽  
The One ◽  
Astronomy And Astrophysics ◽  
Broad Interest

Astrobiology harbours a number of rather diverse disciplines combining expertise in astronomy and astrophysics, biophysics and biology, chemistry and biochemistry, geophysics and geology, as well as mathematics. The need to foster advances in astrobiology are two-fold. On the one hand, there are many scientific reasons: the discoveries of extra-solar planets which contribute to our understanding of the Solar System and the formation of Earth-like planets, the realization that life can thrive under rather extreme conditions making it more probable for life to exist elsewhere in the Solar System and beyond, and the fact that major resources are being spent in developing the technology to produce artificial life, which helps us to appreciate the range of possibilities that nature may have utilized on Earth or elsewhere. On the other hand, astrobiology touches upon some fundamental questions regarding our very existence, and it is perhaps this that attracts the broad interest of scientists and the public alike. As a result, astrobiology networks and astrobiology centres have been emerging all over the world.

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