The Universe has existed for 13.7 billion years. The solar system (containing the Earth) formed approximately 4.6 billion years ago. It took 200 million years to form planet Earth. The average life span of a species (before extinction) on Earth is 4 million years. Even a relatively long single human life lasts only for a total of around 650,000 hours. We are each of us less than a blink of the eye in the history of our Universe – or indeed that of our home planet. Use your hours wisely my friends!
The Universe is rather big. All the visible matter in our solar system (the Earth, the Sun, the Moon, the other planets, the asteroid belt etc) occupies less than one trillionth of the available space.
The average distance between stars in the Universe is over 30 million million kilometres; if you were somehow able to ‘star-hop’ your way across the cosmos…it would take you longer to reach the centre of our galaxy than we (humanity) have existed as a species.
Given the size of the Universe, if you were randomly dropped into it…the chances of you landing on a planet (any planet!) would be less than one in a billion trillion. There is a lot of space in…er…Space!
The Earth weighs approximately six billion trillion metric tons. (One metric ton = 1,000 kilos). 99.9% of the mass of our solar system was used to make the Sun. Everything else formed from colliding microscopic dust particles.
The speed at which the Earth spins varies depending on your location. Here in London I am spinning at 998 kmh. Folks at the Equator are spinning at 1,600 kmh.
The Universe is expanding…BUT…expanding into what?! We simply don’t know! And as for WHY!……..