In ancient times the solar system was thought to be the whole Universe, so the study of planetary motions was cosmology. ... The planets other than the Moon and Sun generally move West to East through the stars, but occasionally stop and move in the opposite direction ( retrograde motion). In order to explain the retrograde motion of the planets, the geocentric model of the Solar System shown above puts the planets on small circles called epicycles . ...

... SS433 is a close binary system, one star is a supergiant, a second one is a black hole. ... Even a black hole cannot accept such an enormous mass flux, a supercritical accretion disk appears, all the excess gas glows up to several tens of thousands degrees and is ejected off the disk with enormous velocities. ... SAO researchers have found an evidence of the supercritical accretion onto a black hole in SS433, which follows from a brightness variability of the SS433 disk. ...

Multi-Wavelength investigations of the Sun and modern problems of solar activity . SAO RAS . ... Section "Physics of solar plasma" under the Council "Sun – Earth" . ... Bogod V.M., Dr.Sci (SPb Branch of SAO RAS) deputy chairman . ... SAO RAS) - chairman . Bogod V.M. (SPb Branch of SAO RAS) - deputy chairman . Mingaliev M.G. (SAO RAS) - deputy chairman . Kostjuk I.P. (SAO RAS) scientific secretary . ... Vitkovskij V.V. (SAO RAS) . Kaltman T.I. (SPb Branch of SAO RAS) . ... RAS | ...