There is the subscription version of Photoshop, which has the most features and greatest editing ability, or there is Photoshop Elements, which is not a subscription, and is what a lot of people get if they don't plan on doing a lot of photo editing. Personally, I would go with the normal Photoshop and Lightroom package for only $10 a month.
I'm looking for something for long term, so a monthly plan is out lol. So your saying elements would be good for editing astrophotography images?
If you definitely do not want a subscription then your only option from Adobe is Photoshop Elements. However that application does not have all the features of the full version of Photoshop.