23/04/2025
The Sky That Speaks with Light
At first glance, it seems like silence, darkness, stars, and cold. But when you look more closely—or through the sensitive eye of a camera—you realize the night sky isn’t black. It’s full of colors and motion.
All-sky photographs taken across various locations in Europe—from the mountains of Slovakia, through the Croatian interior, to the dark skies of La Palma in the Canary Islands—reveal a beauty often missed by the naked eye. Thanks to long exposures and sensitive sensors, a universe opens up before us, glowing in colors we wouldn’t expect from the night.
These images capture airglow—a faint atmospheric glow caused by chemical reactions occurring at altitudes of about 90 kilometers. It most commonly appears as a green or orange veil over the horizon.
Also featured is the aurora borealis, the legendary northern lights, mesmerizing with its dance. In Scandinavia, its homeland, it usually appears as a strong green wave, but during solar maxima, it can surprise even over Slovakia—then it glows in fiery shades of red. It’s a theater of solar wind meeting Earth’s magnetic field, turning physics into something magical.
The night photographs also reveal zodiacal light—sunlight reflecting off dust particles in the inner Solar System. It's visible as a faint cone of light above the horizon just after sunset or before sunrise. Its fainter counterpart, the gegenschein, appears on the opposite side of the sky as a dim, diffuse light that only the most patient observers notice.
A special guest is the comet—a wandering body with a glowing tail, rarely appearing on the night stage. One photo captures its bright core and fading tail pointing away from the Sun. It’s a reminder that the universe is always in motion and sometimes gifts us rare spectacles.
Also present are many emission nebulae—massive gas clouds glowing due to surrounding stars that "ignite" the gas, making it shine with its own light. Some are well-known objects like the North America Nebula, the California Nebula, or Barnard's Loop in Orion. In addition, we see both the summer and winter Milky Way—bands of the galactic disk stretching across the sky, reminding us that we’re part of something much greater.
These images are not just aesthetic experiences. They are records of a reality our eyes often can’t perceive. Human vision has its limits—but modern technology can see what remains hidden to us. Thanks to it, we rediscover the world above our heads—as something alive, mysterious, and beautiful.
Each location where these photos were taken brought its own story. In the Slovak mountains, we hid from light pollution and waited for the sky to reveal its full beauty. In inland Croatia, we watched the Milky Way stretch above a quiet, moonlit landscape. And on La Palma, one of the darkest places in Europe, we almost lost ourselves among the stars.
But in the final photo, in the bottom right corner, we notice something else—light pollution. Artificial lighting from towns and villages brightened the lower part of the sky so much that far fewer details are visible there. In these areas, night is pushed aside, stars vanish, and phenomena like airglow or gegenschein remain unseen. In doing so, we deprive ourselves of the wonders the universe offers.
The night sky is still here—just as it was thousands of years ago—we’ve just forgotten how to look at it. These photographs remind us that even darkness has its light. We only need to look at it differently.
All photos taken with a Canon 6D + Sigma 24mm, 35mm f/1.4 lenses.
