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Asteroids from different places of the ring come in differently effective, and the debris in the vicinity of Earth"s orbit may not be representative of those objects that are moving beyond the orbit of Mars. And only the slowest and strongest of them survive in the Earth"s atmosphere, which leads to further selection. Currently, a lot of attention is paid to the problem of possible collision of asteroids...

Asteroids through cold, lifeless bodies. In the distant past, their depths could be warm and even hot due to radioactive or other sources of heat. Since then, they have long since cooled down. However, the internal heat never warmed the surface: the flow of the heat from the bowels was unacceptably small. The surface layers remained cold, and only collisions caused from time to time a short local heating up. The only constant source of heat for the asteroids remains the distant Sun and therefore heating very badly...

Almost 3/4 centuries people did not suspect that not all asteroids move between the orbits of Mars and Jupiter. But in the early morning of June 14, 1873, James Watson opened the asteroid "Aerta" at the Ann Arbor Observatory (USA). This object was tracked for only three weeks, and then it was lost. However, the results of determining the orbit, although inaccurate, convincingly showed that Aerta is moving inside the orbit of Mars. Asteroids, which would have been approaching the Earth"s orbit, remained unknown until the end of the XIX century...

For the last 30 years, manned research stations (Russian Mir and Salute, American Skylab) have played an important role in space exploration. The astronauts working on them conducted various experiments. These studies provided valuable information about life in space The Mir station, launched into orbit in 1986, has completed its service life. With the completion of the construction of the international space station, which is being created by the joint efforts of America, Russia, the European Space Agency, Japan, Canada and Italy, the era of new-generation spacecraft will begin...

We owe many great discoveries to amateur astronomers who spend hours in the dark looking at the night sky. Many new stars and comets, such as the Hale-Bopp comet, have been discovered by amateurs. Most often an amateur astronomer makes a discovery, watching a small part of the night sky for a long time and checking his observations with the map. This is the only way for an amateur to discover something worthwhile. As a rule, they make their discoveries by accident. The Hale-Bopp comet was also discovered on occasion...