After some thought, I have split PlanetariaX into 2 different versions - Free and Full (Donate).
The free version now contains small adverts at the top of the screen in an attempt to cover my hosting and other costs involved with the development of this app.
Users do have the opportunity to upgrade to the Full version for £1.99 (GBP) which removes the advertising and it is this full version that will receive functionality upgrades in the future - the free version will remain as is.
At this price, I think it's obvious that I'm not trying to rip people off, and I've had a lot of positive feedback from users saying that they like the app and would gladly pay for it! Well, here's your chance to help me out by saying a little thankyou. And, if you don't want to - then you don't have to. Simples.
PS :In the new versions, I think I may have addressed the problem reported on the new phones (but if I'm wrong, please let me know asap!)