Humanity dreams of one day visiting distant star systems and alien planets. But to do so, we'll have to break through the mysterious Oort cloud. So, what awaits us in the darkest confines of our solar system? In this video, Unveiled takes a tour across space to explore the final divide between our star system and the interstellar medium... Hundreds of thousands of astronomical units away from the sun, here's where Space starts to get really weird!

There has to be a moment when the sky is no longer the sky... Right? Well, it depends who you're asking! For this video, we take a look at the various scientific, theoretical and political points at which the sky turns into space. So, how high do you have to go to truly be an astronaut?