Micrometer observations of comets
نویسندگان
چکیده
منابع مشابه
Observations of molecules in comets
Comets are among the most primitive bodies of the Solar System, and their chemical composition is rich in information on the protosolar nebula and its possible connection with interstellar cloud chemistry. Comets are also a source of light atoms and probably of prebiotic organic molecules for the early Earth. We know better and better cometary volatiles through spectroscopy, mainly at infrared ...
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Ultraviolet spectra of seven comets taken with the same instrument are presented. Comets P/Encke (1980), P/Tuttle (1980 h), P/Stephan-Oterma (1980 g), and Meier (1980 q) were observed during November-December 1980 with the International Ultraviolet Explorer (IUE) satellite observatory, while comets P/Borrelly (1980 i) and Panther (1980 u) were observed with IUE on 6 March 1981. The spectra of t...
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This paper reviews the role of past and future visual observations in cometary research. The strengths and limitations of visual observations are explored for the benefit of both investigators who might have to use them and observers who wish to make real contributions to the field. We consider the characteristics of the eye-brain combination as a detector and compare them with modem detectors....
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an inferior hand of genes. Fetuses are today commonly screened for genetic disorders and this service will no doubt expand. An American company has devised a one-inch chip carrying 400,000 DNA fragments, which will allow the entire human genome to be screened for an average of four alleles per gene. The difference between eliminating the undesirable and promoting the advantageous is becoming to...
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A fundamental question in cometary science is whether the different dynamical classes of comets have different chemical compositions, which would reflect different initial conditions. From the ground or Earth orbit, radio and infrared spectroscopic observations of a now significant sample of comets indeed reveal deep differences in the relative abundances of cometary ices. However, no obvious c...
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ژورنال
عنوان ژورنال: Lick Observatory Bulletins
سال: 1915
ISSN: 0075-9317
DOI: 10.5479/ads/bib/1915licob.8.139h