They would get more information about space and look through the telescope and see stars and planets. They would study about planets eg. mercury,Venus,earth,Mars,Jupiter, Uranus,Neptune and our dwarf...
Astronauts like to bring their hobbies from home and do them in space to see how different it is. They also read, watch movies, play games.
They wear wristwatches.
NASA space missions use UTC (Universal Coordinated Time) which is the same as Greenwich Time.
astronauts like to exercise while in the ship