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Hello! Cosmos has always attracted the eye of humans and made them think about the way our world works. In ancient Greece, the vacuum around planet Earth, which was thought to be the centre of the Universe, was called cosmos.

During this lesson you will look at Near and Deep space and assure yourself that our planet is not the centre of cosmos, but only a small drop in the ocean of the Universe. You will learn how the ideas about the structure of our Solar System evolved and generally understand what outer space consists of.

And what should be considered as a beginning of cosmos? Where does it start? According to the international standard setting for astronomy the Kármán line is the altitude where space begins. It is 100 km (about 62 miles) high. It commonly represents the border between the Earth's atmosphere and outer space.

At what height does the official boundary of space begin?

A flight is registered as a space flight if it passes at an altitude of more than [ ] kilometers — here lies the border of outer space.