Yeah, but 5 LY's is literally NOTHING compared to the size of the Milky Way (150 000 Ly's across, and about 2500 Ly's in most thick regions). On a galactic scale, this anomaly is tiny... 30 000 times smaller (width wise)... again, impressive if an artificial construct (plus it would be interesting if it was UFP creation in fact... by intent that is - that would be some feat and probably a bit more interesting in terms of its capabilities - wouldn't be the first time). Plus, if the UFP once spanned some or a lot of he galaxy... at least double (but could be a LOT more) of what it had in late 24th century... that would imply an area of at least 16 000 Ly's with 350 members (at its height before the Burn)... so UFP could have spread to most of Alpha, Beta and possibly even into the Delta Quadrant (or even into Gamma Quadrant). If a larger power joined UFP, they could be considered as 1 member planet which incidentally had a LOT of space... say when the Romulans joined UFP, they'd be counted as 1 member... but the Romulan Empire is decent in size... smaller than UFP yes, but would add thousands of LY's to UFP - anywhere between 30% or 50% in size). If the Klingons joined... thats another 30-50% addition of space with just 1 species counted (but lets say both Romulans and Klingons subjugated several smaller alien races... if they were added to UFP, both would amount to say 20 new alien species perhaps). Cardassia joined UFP eventually too.. Cardassian space would probably be counted as part of UFP. Point being... that depending on how large UFP is in 32nd century (58 planets)... this could in fact point to 16 000 Ly's of space alone.... so, 5 Ly's of anomay is a bit... meh (scale wise). Dangerous? Evidently... but still tiny even compared to 16 000 Ly's... or even 8 000 Ly's. It will be interesting to see how fast this thing travels or changes positions.