Universe, cosmos, and space mean the same – the space all around us and what it contains as far as we can see and think. We do not know whether the space is endless or is finite. If there were a border, what would be behind it? The astronomers are still dealing with the question of the origin of the universe and its end. An important factor to support the Big Bang theory of the origin of the universe is the ‘cosmic background radiation’, which was discovered in 1964. We still wonder whether there are intelligent civilizations somewhere in space – and are looking for them.
