Ask an Explainer

Without a space suit, a human can survive up to 8 kilometers (5 miles) into space. Any space above that is known as the Death Zone because there is not enough oxygen to support life. But with a space suit, a human can go as high as 555 kilometers (347 miles). That's the altitude of the Hubble Space Telescope. Going further into outer space means that space suits will have to be improved to adapt to that environment.