Reading Planet - Mission on Mars - Purple: Comet Street Kids (Rising Stars Reading Planet)

Summary

Comet Street Kids reading books follow the adventures of Rav, Asha, Tess and Finn, four of the residents of Comet Street. There are 144 exciting stories in the series that children won't be able to put down.
Rav and Finn are whizzed from the Planet Zoom theme park all the way to Mars! It's very different to Earth - and it doesn't have as much oxygen! Soon they're running out of air to breathe and decide to leave the planet - but their spacecraft doesn't have any fuel left. Can they work out how to refuel the ship before they use up all their oxygen?