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Scientists have found a new [risky / risk] to space travel. They have discovered that our DNA can change when going [into / onto] space. DNA mutations could increase the risk of space travellers [got / getting] cancer. The scientists did research [in / on] 14 NASA astronauts who took part in the Space Shuttle programme [within / between] 1998 and 2001. The astronauts provided blood samples ten days before they went into space and three days after returning [at / to] Earth. The blood has been [frozen / froze] for the past 20 years. Professor David Goukassian said: "Astronauts work in an [extremely / extreme] environment where many [factors / factories] can result in...mutations." He added: "Space radiation...means there is a risk that...mutations could [envelope / develop] .

Professor Goukassian said his study could be [importance / important] for the future of space travel. In [particular / peculiar] , several nations are working on [sending / shooting] astronauts to Mars. Other countries are [preparations / preparing] to build [bases / basis] on the moon. There is also a race by commercial companies to start the business of space [tourism / tourist] . Goukassian said there were possible health risks to space travel and to exploring [depth / deep] space. He said more research was needed to study the harmful [effects / affects] of space travel on the body. This could be important for NASA's Artemis project. This aims to send people back to the moon for the [first / last] time in 50 years. The last time humans went to the moon was during the Apollo 17 [mission / admission] in December 1972.