Reddit mentions of You Are Stardust

My kids responded well to the idea that we are all part of the universe, so we don't "go" anywhere. Whatever we are has always been here (atoms, etc.) and always will be (well, more or less). They also both liked this book… it's more of about origins, but in the end it's all the same.
http://www.amazon.com/You-Are-Stardust-Elin-Kelsey/dp/1926973356/ref=sr_1_1?ie=UTF8&qid=1425958942&sr=8-1&keywords=we+are+stardust

> he's huge on life cycles so we've discussed the fact that everything is made of the same tiny pieces, and those endlessly recycle into other things (Sagan's starstuff quote was a hit).

Your kid would love the book You Are Stardust by Elin Kelsey :)

There's a picture book which your 8 year old probably could still appreciate and the 5 year old might like (I'm a children's librarian and I love this book). It's not really atheistic per se, but it's called You Are Stardust. I love the illustrations too. Here's an amazon link http://www.amazon.com/You-Are-Stardust-Elin-Kelsey/dp/1926973356