An atom is mostly empty space, but empty space is mostly not empty. The reason it looks empty is because electrons and photons don't interact with the stuff that is there, quark and gluon field ...

Did you know nearly 17,500 satellites have been launched since 1957? Or what about the fact that more than 10% of those launches weren't registered internationally? Subscribe to our newsletter for the ...

How we talk about space exploration shapes the futures we imagine and build. This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert ...