Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to [email protected]. What is beyond outer space? – Siah, age 11, ...

Depending on how you look at it, the universe might not have an "end," after all. This article was originally published at The Conversation. The publication contributed the article to Space.com's ...

Add Yahoo as a preferred source to see more of our stories on Google. Right above you is the sky – or as scientists would call it, the atmosphere. It extends about 20 miles (32 kilometers) above the ...