Which cosmonaut, aboard Vostok 1 on 12 April 1961, became the first human being to travel into outer space?

• A Yuri Gagarin ✓
• B Gherman Titov
• C Alexei Leonov
• D Valentina Tereshkova

Yuri Gagarin completed a single orbit of the Earth in 108 minutes; his flight made him an international celebrity and a symbol of the space age.