Comet C/2023 A3 Tsuchinshan-ATLAS

Unlike the glowing nebulae and distant galaxies that dominate the night sky, Comet C/2023 A3 (Tsuchinshan–ATLAS) is a transient visitor from our own Solar System. Formed from primordial ice and dust over 4.5 billion years ago, it has spent nearly all of its existence in the frozen outskirts of the Sun's domain before making this brief passage through the inner Solar System. It won't be back for another 80,000 years!

As sunlight warms the comet's nucleus, ancient ices vaporize into space, carrying fine dust that reflects the Sun's light while ionized gases are swept away by the solar wind. Together they create the comet's magnificent tail—a luminous reminder that even the smallest bodies in our Solar System are continually shaped by the forces of our nearest star.

Unlike the deep-sky images throughout this collection, this photograph was captured from my own backyard rather than the summit of Maunakea. Comets have a remarkable way of bringing the cosmos home. For a few short weeks, one of the oldest relics of the Solar System hung above neighborhoods, fields, and city skylines alike, reminding us that not every extraordinary astronomical event requires a mountaintop observatory—sometimes the universe comes to visit us instead right in our own backyard.