After watching the launch of Vostok 5 at Baikonur Cosmodrome on 14 June, Tereshkova completed preparations for her own flight. On the morning of 16 June, Tereshkova and her backup Solovyova both dressed in spacesuits and were taken to the launch pad by bus. After completing checks of communication and life support systems, she was sealed inside her spacecraft.
After a two-hour countdown, Vostok 6 lifted off without fault and, within hours, she was in communication with Bykovsky in Vostok 5, marking the second time that two manned spacecraft were in space at the same time. With the radio call sign ‘Chaika’ (‘seagull’), Tereshkova had become the first woman in space. She was 26.
Tereshkova’s televised image was broadcast throughout the Soviet Union and she spoke to Khrushchev by radio. She maintained a flight log and performed various tests to collect data on her body’s reaction to spaceflight. Her photographs of Earth and the horizon were later used to identify aerosol layers within the atmosphere.
Her mission lasted just under three days (two days, 23 hours, and 12 minutes). With a single flight, she had logged more flight time than the all the US Mercury astronauts who had flown to that date combined. Both Tereshkova and Bykovsky were record-holders. Bykovsky had spent nearly five days in orbit and even today he retains the record for having spent the longest period of time in space alone.