Space is a vast space surrounding the Earth, with all its planets, stars, and a huge number of other objects. Many of them continue to be born and die, like black holes or supernovae, whose explosions are periodically recorded by telescopes.

We are ready to answer your most popular questions about space: why is there weightlessness in space and how does it destroy human bones? How did space arise or where did it come from? What would happen to a man if he died in outer space?

Astronomers rarely operate with kilometers. To say that the distance from the Earth to the Moon is 384.4 thousand kilometers is still possible, but with other objects the numbers become much longer. To measure the distance within the solar system, a special astronomical unit is used - au (a. e.). It corresponds to the size of the semi-major axis of the Earth's orbit and simultaneously the distance between the Earth and the Sun. In 2012 the astronomical union has decided to define the exact number for a.u. - 149 597 870 700 meters. The convenience of using the unit is that when measuring distances to objects, it is possible to compare them with the distance of a planet from the Sun. For example, the distance from Earth to Uranus is about 20 a. u.