Have you ever stopped to think that the universe—the vast stage where everything happens—might be just a small part of something much bigger and more mysterious? Everything we know—stars, galaxies, planets, even cosmic radiation—lies within a giant sphere called the observable universe. That sphere marks the farthest distance light has traveled to reach us since the start of everything, the Big Bang, which happened about 13.8 billion years ago. . . . . . . . . . Music by Pixabay: https://pixabay.com/music/ambient-neb...