Explaining The Universe on Instagram: "The observable universe is unimaginably vast—about 93 billion light-years across—but that’s only the part we can see. Because space itself has been expanding since the Big Bang, light from very distant galaxies has taken so long to reach us that the actual distance to those galaxies today is far greater than their “light-travel time.” Beyond the observable horizon, the universe likely continues, possibly infinitely, but we can’t detect it because light from