A tiny planet hides a spectacular secret in the darkness of space. Mercury, the closest planet to the Sun, leaves behind a faint, glowing trail made of sodium atoms released from its rocky surface. Solar radiation pushes these particles outward, creating an enormous structure resembling a comet’s tail. Although invisible to the naked eye under ordinary conditions, this phenomenon reveals the powerful connection between Mercury and our star. The glowing trail changes as Mercury travels along its orbit, offering scientists clues about the planet’s surface and its interaction with sunlight. Even the smallest planet can create a cosmic spectacle.
