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In 1857 he joined the staff of the observatory at Moscow University, becoming its director in 1865 (another source says 1873). In 1890 he became director of Pulkovo Observatory (until 1894) and in the same year became a member of the Russian Academy of SciencesRussian Academy of Sciences is the national academy of Russia. This organization includes scientific institutes all over Russian Federation. To be a member in the RAS is extremely honorable and means a certain acknowledgement from direction of colleagues..
He studied the theory of cometHalley's Comet nucleus sunlit from the left. A comet is a relatively small astronomical object similar to an asteroid but composed largely of ice. In Earth's solar system, the orbits of comets may extend past that of Pluto; of the comets which enter the i tails, and also studied meteorA meteor is the visible path of a meteoroid that enters the Earth's (or another body's) atmosphere, commonly called a shooting star''. The visibility is due to the heat produced by the atmospheric entry. A very bright meteor, brighter than the apparent mas and meteor showerFrom earliest times, humankind has noticed flurries of meteors that seemed to emanate from particular points in the sky at particular times of the year. These flurries, now called meteor showers are produced by small fragments of cosmic debris entering ths.
A craterThis article is about impact craters. For volcanic craters, see Caldera. For the constellation, see Crater (constellation). A crater basin or impact crater is a circular depression on the surface of a planet, moon, asteroid, or other celestial body. Crate on the MoonFor other moons in the solar system see natural satellite. For other uses see Moon (disambiguation). The Moon is the only natural satellite of Earth. It has no formal name other than "The Moon" although it is occasionally called Luna ( Latin for moon to d is named after him.
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