This is a fairly straightforward question, but one that has led to some debate in my group. We know that aspects are generally not reflections of physical reality but rather narrative focus, so things may exist in a scene that are not necessarily aspects, but can be made aspects through use of a "create advantage" action.
The requirements for this action, as set out by the rules, are: 1. Taking the action, and 2. Succeeding in a roll.
1 is easy enough - if one really goes through every scene by turn sequence (which is something that FATE seems to imply should be done), turning a circumstance into an aspect should be an action at least, leaving the player unable to act until it's their turn again.
2 is a bit more tricky. Sometimes, a roll does not make any sense. Do I really have to ask the player of a +5 awareness character to make a roll in order to turn the obvious treeline behind the enemy in broad daylight into an aspect (I chose a treeline as an example because that is the kind of thing that one would not necessarily have as an aspect established in the scene in the first place but might have mentioned in the description)? What other alternatives are there to this, though? There's only one 'create advantage' action, and it always creates the same thing, based on the same assumptions, regardless of what the context actually is.
Finally, there is also the issue of single-use aspects that are easy to establish but will inevitably disappear after one use. "Preparing to fire" is one of these - after the character has fired, this aspect is logically gone, even though the action used (create advantage) might have given its creator another free use or more. So basically, a player would have wasted the same effort they would have used for a full aspect to get what is effectively a boost.
So, the question boils down to this:
Do players have to roll for everything or is there an alternative for discovering obvious aspects?
Is there a way to directly create boosts instead of aspects, possibly because one can only think of an aspect at that particular moment that would be gone after a single use anyway?