Does outer space end – or go on forever?

It can stretch your mind to ponder what's really out there. Stijn Dijkstra/EyeEm via Getty Images 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 curiouskidsus@theconversation.com. What is beyond outer space? – Siah, age 11, Fremont, California Right above you is the sky – or as scientists would call it, the atmosphere. It extends about 20 miles (32 kilometers) above the Earth. Floating around the atmosphere is a mixture of mol