I hadn't heard of 172 Hours on the Moon until I was looking over the list from YALSA's Teens' Top Ten nominees for this year-- 28 nominees which will be narrowed down to the top ten by the teens who participate in the voting this month. Not a bad book, especially if you have visions of a little interplanetary travel yourself one of these days. Here's the review I posted on Goodreads:
In 2019, 3 teenagers are chosen through a lottery to head to the moon with NASA astronauts. What NASA doesn't tell anyone is that in the moon-travel heyday, some unexplainable stuff happened during the various missions, and they need to get back up there (hence, the "teens win the chance of a lifetime" lottery... get the public psyched about space travel in a time of budget deficits). So Mia from Norway, Antoine from France, and Midori from Japan make their way to the moon and to some incredibly creepy stuff (view spoiler)[involving doppelgangers (hide spoiler)]. Character development is definitely not the strong point in this novel, but the book is certainly a page-turner, especially if you like your space travel on the spooky and suspenseful side.
If you are between the ages of 12 and 18 and you haven't voted yet, there's still time. You can vote online for your three favorites out of the twenty-eight nominees at http://www.ala.org/yalsa/reads4teens/. The ballots are open through October 19, and the top ten will be announced on the YALSA website the week of October 21.