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Children that young don't need to know the detail. They can't comprehend numbers that big anymore than adults can.
I've always used a bit of "real world" comparison to make it easier. For example:
- If our sun was squished down to be the size of a basketball, then you would have to squish our world down to a pea and you can compare the other planets the same way.
- The rest is about how things go together; planets spin around the sun and every time you have a birthday, you have gone around the sun once. The earth takes a whole day to spin just once.. ooh ah !
- The sun is in a galaxy made up of lots of stars and its so big, the last trip the sun took around it took longer than the dinosaurs were around!
- There are more galaxies than you could ever count...
- The stars are so far away that you could fly a rocket until you were an old man/lady and still not get to the closest one.
That's about the limit of comprehension until children get to high school. It works pretty well in my experience and, when you get a brighter spark, you can extend it a bit further.
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