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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

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

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

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

These are questions scientists don’t have definite answers to yet. Many think it’s likely you would just keep passing galaxies in every direction, forever. In that case, the universe would be infinite, with no end.

 

Jack Singal, University of Richmond

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 molecules – tiny bits of air so small you take in billions of them every time you breathe.

Above the atmosphere is space. It’s called that because it has far fewer molecules, with lots of empty space between them.

Have you ever wondered what it would be like to travel to outer space – and then keep going? What would you find? Scientists like me are able to explain a lot of what you’d see. But there are some things we don’t know yet, like whether space just goes on forever.

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