distance....

Space is measured in different ways. One way is AU meaning astronomical units. This is used when you want to measured anything between the sun and the earth. KM is used on earth, to measure big distance lets say form a town to a town. LY, is light years, they are huge. They are used to measure big spaces in the universe.
We are 1 AU from the sun. I Don't think we will ever be able to land on the sun. It is way to hot and it is far to get there. we have a better chance going on the moon than the sun.