What is a Cosmic Distance?
Space is huge. It is so immense that it is very difficult to imagine the distances involved, even between the objects in our local neighbourhood, the Solar System.
If astronomers used kilometres to describe these distances, they would have to use massive numbers. Therefore, to simplify things and make the numbers smaller and easier to handle, different measurements are used.
This is a big number, and so astronomers use the astronomical unit to describe this distance. One astronomical unit, or ‘au’, is the distance between the Earth and the Sun. It is used to compare the distances of other bodies in the Solar System, such as the Sun, the planets, comets, and asteroids.
DID YOU KNOW ?
The distance between the Earth and the Sun…
