Astronomy for beginners: astronomy a self teaching guide

The study of spectral data on asteroids obtained in the last
~ 30 years, made it possible to establish the predominant state of their matter. It turned out that ~ 75% of the main belt asteroids (Fig. 1) are they are active, that is, they have low-temperature mineralogy. This indicates on similar conditions and general mechanisms of the formation of such small planets in the early solar system - possibly beyond condensation water ice.
Previous publications have already discussed the meaning of the presence in the matter of the circumsolar protoplanetary disk of a short-lived isotopes (in decreasing order of abundance of 26 Al, 53 Mn, 60 Fe, etc.) with periods half-life approximately one to several million years, radiogenic heat which created short-term physical and chemical conditions for the formation development of silicate-water mineralogy in the early solar system (RSS) in the bowels of small planetary bodies, including the parent bodies of asteroids, opdetermined the composition of the latter (let us clarify that the asteroids accepted consider bodies of predominantly stone or silicate composition), (for example,
[12]). We have shown [3] that such conditions could arise in bowels of all fairly large rock-ice bodies (with a size of more than 200 km) in the entire outer periphery of the early solar system, including the belt Edgeworth-Kuiper bodies, provided a sufficiently high initial concentration the concentration of short-lived isotopes (mainly 26 Al) in silicate matter the central region of our protoplanetary disk, corresponding
the average value of this parameter ( 26 Al / 27 Al ~ 10 –5 ) near the equatorial
the plane of the Galaxy [1] and in meteorite matter [2, 4]. As a possible the mechanism that provided the specified content of 26 Al is considered there is an explosion of the nearest supernova of the Wolf-Rayet type, which served impulse also for the formation of the Sun [5]. As follows from the accumulated observational data available to date and numerous efficient calculations, the above and subsequent physical and chemical processes in the bowels of small planetary bodies, variations in temperature gradient comrades in the RCC, as well as dynamic and shock processes associated with the growth giant planets and terrestrial planets have probably become complex khanism of the formation from the structure of the modern Main belt of asterodov (GPU). In Fig. 1 shows the heliocentric distribution of astroids, on which, as will be