Explaining The Universe on Instagram: "The observable universe spans roughly 93 billion light-years across, an enormous region defined by how far light has been able to travel since the Big Bang. Because space itself is expanding, many galaxies we see are now far farther away than when their light began its journey to us. Beyond this observable boundary, the universe likely continues—perhaps infinitely—but we cannot detect it because light from those distant regions hasn’t had time to reach Eart