First of all, space is really fucking vast.
And it doesn't end there. So, where does the universe end? No one knows exactly – hell, we don't even know if it ends at all.
And what exists amongst this massive expanse? Well, black holes, for a start.
Black holes are regions in space-time that have so much mass making the gravity there so strong, nothing we know of can escape – not even light. That's right: there is literally NO ESCAPE.
So if you happen to be unlucky enough to get caught in its unforgiving force, you're future doesn't look too bright; Physicists are still debating whether you'd get burned to a crisp, or snapped like an over-extended elastic band in a process called spaghettification (no, seriously). Neither of which sound like much fun.
But honestly, what do you expect from something that is usually created by a big fuck-off explosion.
Most black holes are formed when a large star dies and goes supernova, which is the largest explosion that takes place in space – so definitely something that you'll want to avoid.