What does a space in a jquery selector mean?

Question

I ran into a reaction I couldn\'t explain today while working with some very basic Jquery today and I was hoping one of you could explain to me what is occurring to lead to

Answer 1

$('div.ObjectContainer').find('div.Object :last') results in a wild card effect. it looks for any child with the psudo class of :last. Thus it simply picked div:last. It's equivalent to $('div.ObjectContainer').find('div.Object div:last')