Primitive man knew and comets. The brightest are looking good and not resemble any other object in the sky. They look like spots of light, often blurred, they leave a trail or hair. This makes them attractive and surrounded by magic and mystery. Comets are fragile bodies and small, irregularly shaped, formed by a mixture of substances hard and frozen gases.
Until the twentieth century, the idea of space travel was too advanced kinds of scientists or writers with great imagination. The knowledge of space, if only you could see with the naked eye, was limited and often based more on magic or religious beliefs in reality.
The Solar System consists of the Sun and those celestial objects bound to it by gravity, all of which were formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago. Of the many objects that orbit the Sun, most of the mass is contained within eight relatively solitary planets[e] whose orbits [...]
Space exploration is the use of astronomy and space technology to explore outer space. Physical exploration of space are both driven by human spaceflights and by robotic spacecraft.
