Changes in the Zodiacal Cloud
Article Abstract:
Measurements of the 3He solar ion concentration in the interplanetary dust show that the amount of interplanetary dust flux produced by the Zodiacal Cloud has been not been constant in the period from 0.19 to 69.27 million years ago. Asteroids and comets contribute to the dust and the composition of the dust reflects that of the parent body. In the present age, the interplanetary dust flux has increased probably due to a few main events such as the disruption of a large asteroid because the composition of the dust falling on the earth is not diverse.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Struggling with hieroglyphics
Article Abstract:
A new celestial object has been detected that may be a nascent galaxy, although the difficulty of interpreting the contradictory data obtained thus far is impeding a full understanding of the object, now identified by the catalogue number F10214+4724. European, American and Japanese astronomers have used infrared detectors to study F10214+4724 since optical telescopes cannot obtain a clear view. Some observations, such as the presence of carbon monoxide, suggest that the object is a galaxy in the process of developing.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Evidence for single-temperature dust in the Crab nebula from a reanalysis of its infrared spectrum
Article Abstract:
The Crab nebula, a neutron-star-powered nebulosity left behind by the supernova of 1054, has an infrared spectrum with flux densities that probably result from the nebula's single dust component with a temperature of 46 K. Furthermore, this dust mass amounts to 0.02 solar masses with a corresponding gas to dust ratio of 100:1. A re-examination of data from the Infrared Astronomical Satellite yielded these conclusions concerning the nebula's mysteriously excessive infrared output.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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