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Jeff Bezos' Amazon is preparing to launch the first satellites of its constellation, which will provide Internet access from space and compete with rival Elon Musk's Starlink.

The lift-off of SpaceX's Polaris Dawn rocket for a first-of-its-kind space mission, including the first private spacewalk in history, is scheduled for Friday after being postponed last week, US authorities announced on Tuesday.

An experiment in which four volunteers simulated life on Mars has come to an end after just over a year. The participants were able to leave the Mars Dune Alpha simulator, the US space agency Nasa announced on Saturday.

The Starship spacecraft, designed for voyages to the Moon and Mars, successfully ditched for the first time on Thursday after re-entering the Earth's atmosphere, around an hour after the mega rocket's fourth liftoff, according to SpaceX.

A Russian Soyuz spacecraft docked on Saturday night to the International Space Station in order to serve, next September, as a vehicle for the return to Earth of two Russian cosmonauts and an American astronaut, whose initial spacecraft was damaged.