Turkish riot police have fired rubber bullets to block demonstrators from entering an Istanbul park, the birthplace of deadly unrest in June.
Officials say a 22-year-old man has been shot during a demonstration in Antakya city, near the border with Syria, and later died in hospital.
Turkey's prime minister has rejected claims that he is a "dictator" as thousands have returned to Taksim Square to protest against the government.
Turkish forces have begun to withdraw from a main Istanbul square in an apparent move to end tensions from two days of anti-government protests.
Associate Professor James O Chibueze and Dr SP van den Heever are part of an international team of astronomers studying the G358-MM1 high-mass protostar.