Rhodesia
In Astronomy, interstellar cloud is the generic name given to accumulations of Gaz and Poussière S in our Galaxie. The Hydrogène contained in an interstellar cloud can, according to the Densité, the size and the Température of the cloud, neutral being (Région HI), ionized (Région HII) or molecular (molecular Nuage).
Chemical composition
The analysis of the composition of the interstellar clouds is carried out by studying the electromagnetic Rayonnement which they emit. Large the Radiotélescope S sweeps the sky in the search of Fréquence S particular of electromagnetic radiation which is characteristic of the spectrum some Molécule S. The interstellar clouds are cold and tend to emit only with large wavelengths. We can chart the abundance of these molecules in order to include/understand the various compositions of these clouds.
The radio telescopes can also sweep the frequencies emitted by the same point of the sky and thus record the intensities of each type of molecule present in this area of the sky. The intensity of the received signal is proportional to the abundance of the atom or the molecule corresponding to this frequency.
Discovered unexpected molecules
Until recently one supposed that the rate of reactions in the interstellar clouds are very slow, very few made up being produced because of the weak density and the low temperature of these clouds. However, one observed in the spectra of large the organic molecules that the scientists did not think of finding under these conditions. The reactions necessary to their creation occur normally only at temperatures and pressures much higher. The fact that they were found indicates that the chemical reactions existing within the interstellar clouds occur more quickly than one thought it. These reactions are studied in the Expérience CRESU.
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