Behind the Conquerors of Space Monument in its base is the Cosmonautics Memorial Museum (more commonly known as the Space Museum), which was first opened in 1981 as part of the 20th anniversary celebrations of Yuri Gagarin's historic space flight. In 2006 the museum was closed for large-scale renovation work and only reopened in 2009, becoming once more an especially popular attraction in the capital among people of all ages. The museum has many exhibits detailing the history of space exploration, including models of rockets, space capsules and moon-rovers and examples of spacesuits and space food. The stuffed bodies of Belka and Strelka, the first two dogs to orbit the Earth and return alive, are also on display at the museum as is the capsule they went up in.  Admission to the museum is free on the third Sunday of the month.