“The universe as a whole is expanding” 1 Earth
Earth’s diameter is 12,756 kilometres (7,926 miles). The Moon orbits Earth at an average of 384,400 kilometres (238,855 miles).
2 Solar System
The outermost planet in the Solar System, Neptune, orbits the Sun at a distance of 4.5 billion kilometres (2.8 billion miles).
3 Living local
Stars in our local region of space are separated by light years – tens of trillions of kilometres. The brightest star in the sky, Sirius, is 8.6 light years away.
4 Home galaxy
Our Sun and Solar System, and all the stars in our sky, are members of the Milky Way – a vast spiral of stars that’s roughly 120,000 light years across.
5 Grouping up
The Milky Way is a major member of a…