Young adult fiction about a group of kids training to be astronauts

Question

I remember reading a book back in primary school, 5 or 6 years ago, about a group of kids who were part of a program to become astronauts. I vaguely remember that they were the second program, the first one ended in disaster with a blown up rocket. I remember that a ghost of one of the kids in the disaster was haunting the place and the protagonist who was a boy was trying to find out if he actually died. Can't remember much more than that, would be great if someone knew the book, I'd like to read it again! Thanks in advance for any help.

*Edit - the protagonist got very lucky was selected out of many kids, another character was a girl and I think he liked her and also there was an antagonist boy who was always a dick to the main character.

*Edit 2 - It's definitely based on Earth and im sure it wasn't specified where they were going in space, just that they were going. and the book is not as well known as Enders game: so no movie I'm pretty sure. The book was standalone too. Most of the story was the protagonists interaction with others and doing tests.

I remember one of the tests was a gforce test and they spun around a lot and the kid thought he would vomit but he didn't, then someone else did vomit and someone else had to go into the now vomit filled machine and everyone laughed. - just a small scene but it may help.

I'm pretty sure the protagonist thought he was seeing a ghost of this boy from the fail rocket, but in the end it was the boy himself, and he was trying to make sure it didn't happen again or something like that. Also the story isn't futuristic like Enders game and it has no aliens. It is pretty modern time with spaceships we have today (rockets).

Answer 1

Is it 172 Hours on the Moon?

Synopsis as per Goodreds:

Three teenagers are going on the trip of a lifetime. Only one is coming back.

It's been more than forty years since NASA sent the first men to the moon, and to grab some much-needed funding and attention, they decide to launch an historic international lottery in which three lucky teenagers can win a week-long trip to moon base DARLAH 2 - a place that no one but top government officials even knew existed until now.

The three winners, Antoine, Midori, and Mia, come from all over the world. But just before the scheduled launch, the teenagers each experience strange, inexplicable events. Little do they know that there was a reason NASA never sent anyone back there until now-a sinister reason. But the countdown has already begun...

Answer 2

This sounds a LOT like Ender's Game. Is it possibly that?