About a girl who enters a competition to go to space but the ship gets sucked into a wormhole

Things I can remember: -The book is about a girl who enters this competition to go into space. -One of the tests was a colour test and they also had to go in one of those spinning things -The woman running the competition was very rich -The ship was called the Adventurer -They went past jupiter -They stopped of at this re-fuling station, there was wine and they had to do a space walk to get into it -They get sucked into some sort of wormhole which is making everything younger. -Everybody was told that the ship was new but the ship doesn't start getting 'younger' for a couple of years worth of 'youngening' -There was a really young clever boy talking about shrodingers cat