About cosmos. -Gravity, an invisible force, that is also called attractive power which attracts planets to each other. -The Earth plays inique role in the solar system, it's the only planet that has living conditions on it. -The Earth has only one satellite, Moon, moving around the Earth's orbit. -Some enthusiasts hope that by 2030 the first austronauts wil be able to reach the Mars. Space bases may be built during further flights. Growing and improving they finally will be able to become the space vehicle-launching site to more distant depths of space. - Asteroids are large blocks of potassium and metal left without consumption 5 billion years ago. - In 1687 the English physicist and astronomer Isaac Newton wrote the book "Mathematical Principles of Natural Philosophy" which forever changed people's mind about the universe and about their place in it. -The universe is all that exists from an atom to galaxy. According to the Big Bang theory the universe originated as a result of a terrible, unimaginably powerful explosion more than 15 billion years ago. -The existence of extraterrestrial civilizations attracts the attention of scientists. - Tycho Brahe, the Danish scientist,discovered the first star in 1572. this discover brought him the fame. In total he opened 700 stars. -Through the space program began in the USA in 1962, the first woman-cosmonaut flew into space in 1983. She was selected by NASA from 8370 candidates. -There was found a potentially livable planet that is located at a distance of 20 light years from the Earth outsidethe solar system. According to the American astronomers there may be liquid water on the surface of the celestial body and estimated gravity indicates an atmosphere. The authors of the discovery from the University of Calofornia, Santa Cruz and Carnegie institute in Washington report that if these conclusions are true to reality then we are talking about the planet with the most optimal living conditions among the all opened celestial bodies(besides the Earth).