The star, next to the Sun, is the Proxima of the Centaur, the distance to it makes only 4.2 light years. However in our sky it shines weaker than stars which are in visibility limits with the naked eye.
Life of people of Earth cannot be presented without the Moon. The night star not only inspires poets, it made possible origin and preservation of life on Earth. At all times the Moon raised a set of questions for the person.
"The invention of the bicycle" is actually not as bad as can seem at first sight. When studying a course of physics to school students often suggest to calculate the known value long ago: acceleration of gravity. Once calculated independently, it settles in the heads of pupils much more densely.
Expression "to win against gravitation", perhaps, sounds as excerpt from the fantastic novel, however, in practice in overcoming an attraction of the earth there is nothing supernatural. For this purpose it is only enough to apply to an object the force exceeding force of an attraction and sent to the opposite direction.
The observer who is on Earth, taking a view of boundless open spaces of space which is not able to present Universe scales. It is even more difficult to comprehend temporary borders of existence of the world in which the Solar system with its several planets got lost. The question of the future of the Universe and terms of her life is of special interest for scientists.