Yuri Gagarin's niece recalls the day he went into space
4 April 2011 Last updated at 01:28 BST
When Yuri Gagarin, the first person to exit the Earth's atmosphere, blasted off into space on 12 April 1961, millions of people marvelled.
But one teenager was petrified.
It was Yuri's 14-year-old niece, Tamara Filatova.
She recalls the moment when she was told that her uncle was in space.