Khayelitsha pupils make radio contact with space tourist Mark Shuttleworth on Friday night on an amateur ham radio linkup.
Weather permitting, the transmission at 7.50pm from the Solomon Mahlangu Recreational Centre will end a successful series of live ham radio linkups between South African pupils and Shuttleworth.
At 5pm on Saturday Shuttleworth leaves the International Space Station, where he has spent a week, to return to the Soyuz module for the return trip to earth.
The ham radio project has been an exciting experience for schoolchildren.
Seventeen schools were selected by the department of education, mostly in Khayelitsha and the surrounding area.
They included Bulumko, Chris Hani, Glendale High, Hector Petersen, Joe Slovo High, Kayamandi, Khanyolwethu, Khayelitsha Senior Secondary, Kwamfundo, Masiyile, Matthew Goniwe Memorial, Montagu Drive Primary, Rylands High, Thembelihle, Uxolo, Zola Secondary School and Livingstone High.
The pupils took part in a competition to submit questions that they would like to ask Shuttleworth over the radio.
Those who came up with the 12 best questions were selected to speak to Shuttleworth.
The event will be broadcast live on several local and national radio stations and on the dedicated afronaut channel on DStv.
The winning questions included one by Makhetha Mbuluki, a Grade 8 pupil at Thembelihle Senior Secondary School, who asked: "Is there darkness and light days as on Earth?" and one from Nange Zodwa, a Khayelitsha High Grade 9 pupil, who wanted to know what happened to tears if someone cried in the weightless conditions of space.