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According to the dictionary, an astronaut is a person who is professionally trained to travel in a spacecraft. "Astronaut" is the term used by NASA since the start of their space programme. The Russian Federal Space Agency (or its Soviet predecessor) uses the term "cosmonaut".

Gabriel Tobie, 18/08/2023 The Galileo mission (1996-2003) provided clear evidence that the Galilean moons, Europa, Ganymede and Callisto, harbour a salted water ocean underneath their cold icy shells. Various salt and simple organic compounds have been identified at their surface by infrared spectroscopy. But it

by Alexandra Pais Jupiter hosts the most wide and strong windstorm known in the solar system. The Great Red Spot is a huge anticyclone of hydrogen and helium winds, powered from inside the planet. It is probably the same storm that has been seen since