Odille,
Rather than download the apps via your phone, use iTunes and use your Internet connection to download the apps. If you have a wireless network at home, connect to that and use that to download the apps. Then, run a sync in iTunes and it'll install the app for you.
Planetarium software will not use any data, as all the skymaps and objects are built-in.
To uninstall, connect to iTunes, go to the Apps link on the left. It will now bring up icons for all your apps. Simply right-click and delete (or uninstall, I can't remember).
Hope this helps.
H
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