We summarize in this paper the principles for the algorithmic representation of the structure of a stellar atmosphere. The physical analysis of the problem leads to the classification of the elementary blocks that constitute a stellar atmosphere model and suggest the numerical algorithms required for its computation. Compatibly with the space

Using the NOT, WHT and TNG telescopes located at Observatorio del Roque de los Muchachos (Canary Islands, Spain) we have obtained low resolution visible and near infrared spectra of more than 30 Near Earth Asteroids. These observations are part of and observational campaign that started on August 2002 and that also includes photometric and

Gravity modes are the best probes to study the solar radiative zone, in particular the nuclear core and to follow its potential variability with time and latitude. Nevertheless, their amplitude is small and the solar noise particularly high in the range of frequency where they stand (below 500 μ Hz). It is why they are looked for more than 20 years

Gravity modes are the best probes to study the solar radiative zone, in particular the nuclear core and to follow its potential variability with time and latitude. Nevertheless, their amplitude is small and the solar noise particularly high in the range of frequency where they stand (below 500 μ Hz). It is why they are looked for more than 20 years

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Using the results of optical identification of the diffuse X-ray sources in both CDFS and LH fields, we have compiled a catalog of objects containing over 10 groups and clusters of galaxies with redshift larger than 0.6. We present the properties of this sample.