Results 321 to 330 of about 3,893,324 (356)

Discovery of a Young Planetary-Mass Binary

Science, 2006
We have identified a companion to the young planetary-mass brown dwarf Oph 162225-240515. This pair forms a resolved binary consisting of two objects with masses comparable to those of extrasolar giant planets. Several lines of evidence confirm the coevality and youth of the two objects, suggesting that they form a physical binary.
Ray, Jayawardhana, Valentin D, Ivanov
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Producing Planetary-Mass Objects

Science, 2001
ASTROPHYSICS Models suggest that stars form by the gravitational collapse of a molecular cloud, whereas planets form in circumstellar disks around young stars by accretion. Recent observations have uncovered isolated planetary-mass objects, and neither model is adequate to explain these ...
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Mass spectrometry in planetary research

International Journal of Mass Spectrometry and Ion Processes, 1985
Abstract The availability of rockets and space probes has made possible in situ investigations of the earth's upper atmosphere and the atmospheres of other planets and comets. Mass spectrometers are able to make both gas and isotopic analyses. They have played a major role in the study of the earth's upper atmosphere and in the investigation of the ...
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Catapulting mass from planetary objects

Acta Astronautica, 1983
Abstract We examine the motion of a superconducting dipole in the field of a large flat solenoid. It is found that energy mass ratios of about 1 MJ per kilogramme of dipole can be reached for an effective current density of about 400 A/mm2 in the dipole if the diameter of the dipole and solenoid are of the order of 6 and 30 m, respectively ...
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Laser Mass Spectrometry in Planetary Science

AIP Conference Proceedings, 2009
Knowing the chemical, elemental, and isotopic composition of planetary objects allows the study of their origin and evolution within the context of our solar system. Exploration plans in planetary research of several space agencies consider landing spacecraft for future missions. Although there have been successful landers in the past, more landers are
P. Wurz, J. A. Whitby, G. G. Managadze, Masfumi Hirahara, Yoshizumi Miyoshi, Naoki Terada, Toshifumi Mukai, Iku Shinohara   +7 more
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Mass spectrometry for planetary science

2002
Attaining a satisfactory understanding of the origin and evolution of the solar system and life within it are among the primary scientific goals of current and future planetary missions. One important clue to understanding these questions is the chemical and isotopic composition of atmospheric and surface volatile materials.
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Photon mass and planetary magnetic fields

Journal of Physics A: Mathematical and General, 1977
The existence of a photon mass implies additional components of static magnetic fields. Schrodinger's expression for a dipole field is here extended to a complete spherical harmonic analysis of a static planetary field. Additional components of the magnetic field are identified which are due to a photon mass.
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Mass Spectrometers Developed for Planetary Missions

1999
Mass spectrometers have played a major role in the exploration of our planetary system by robotic spacecraft. The chemical and isotopic data from this technique provides constraints on models that address fundamental questions of Solar System formation and evolution.
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Planetary masses and distances

Astrophysics and Space Science, 1969
B. W. Pendred, I. P. Williams
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The System of Planetary Masses

Science, 1971
Michael E. Ash, Irwin I. Shapiro, William B. Smith   +2 more
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