In the history of astronomy there is a before and after the moment, still close, in which humans were able to leave space.
The law of universal gravitation, enunciated by Isaac Newton, says that any particle of matter attracts each of the others with a force directly proportional to the product of their respective masses and inversely to the square of the distance that separates them.
As the stars are in constant motion, the centrifugal force caused by this movement partially counteracts gravitational attraction, creating a very complex tangle of interactions between some bodies and others.
The gravity that interests us in this case, that of the Earth, is very powerful. It keeps us on its surface and shapes our entire world. At an intuitive level we know that every body released in the air will fall in the direction of the Earth's center of gravity with an acceleration, that is, its movement will be faster and faster as time goes by.
Beating this force was the first astronautics challenge. But not the only one. The conditions that the materials used and the possible living beings should endure are extreme. Even so, since the mid-twentieth century, many efforts have been devoted to travel through space, beyond the Earth's atmosphere.
This chapter contains a series of articles on astronautics.
In this chapter:First manned trips: NASA's first manned spaceflight program was the Mercury Project… Read page The astronaut trade: How do you get an astronaut? What requirements do you have to have to be chosen as the protagonist of a… Read page Saturn and the Voyager probes: Saturn, the sixth planet of the Sun, is in orbit at a distance of 1,430 million kilometers and is… Read page Russian and American Rockets: The Technological developments, together with interested political considerations, influenced ... Read pageThe Mercury project in orbit: On April 12, 1961 the Soviets launched the first man into space. The American answer is… Read page First female astronauts: June 16, 1963 is a historic date for astronautics and humanity: Valentina… Read page Rocket-propelled planners: The idea of a rocket-driven glider is as old as the first machines flying ... Read pageFirst voyage of the Columbia: When in October 1977 the astronauts Haise and Fullerton terminated the test series of ... Read pageFirst flight of the Shuttle: The Shuttle space shuttle program foresaw that the first four flights of Columbia in the … Read page The European Space Agency is born: In December 1960 some European scientists decided to form a commission to promote… Read page