If anything lays beyond the cosmos is a very debatable, controversial thing. Some believe that to say there is not anything would rule out the possibility of there being a God in heaven as the Bible teaches. Many believe that there are things beyond the cosmos but differ in what they think it actually is. Scientists have begun to take a glimpse into what they feel is beyond the cosmos.
National Geographic has some shows on television exploring the situation too. It is projected by many that we will one day know what lays beyond it. The fact is pretty clear that something does because there is evidence to support such a belief. What it is exactly is not clear and proven at this present moment however.