Another interesting result from the AAS. Extended UV discs were a hot topic back in 2008 but haven't had much attention since, so it's nice to see them back again.

The weird thing is that some galaxies, about a third of all spirals if I remember rightly, have young stars found well beyond their main stellar disc. That's strange because there's not much gas out there so not scope for star formation, and if they've migrated from the inner disc then it's weird that there aren't older stars as well.

Now it looks like star formation is indeed happening in these regions, but the molecular clouds are especially small and the conversion from atomic to molecular gas is inefficient. Why ? No idea ! Maybe the final publication will have more answers...

#Astronomy
#Science
#Space
#Galaxies

https://www.universetoday.com/165141/young-stars-in-the-outskirts-of-galaxies-finally-have-an-explanation/