Our solar system has a wall. The heliopause – the region of space in which solar wind isn’t hot enough to push back the wind of particles coming from distant stars – is often considered the “boundary wall” of the Solar System and interstellar space.
100 Mind-Blowing Interstellar Facts
Einstein’s theory also states that gravity can warp time. If you’ve seen the 2014 movie Interstellar, this concept may seem familiar. The closer you are to a massive body—which, in the case of Interstellar, is a giant black hole—the slower time will pass for you.