Inverted Illumination

This image presents a flower in its negative form. By inverting the light values, the petals transform into glowing forms, highlighting subtle textures and gradients that often remain unnoticed. [OPN 2025 Photo Contest]    

—Sritam Sethy Kumar, M. Pharm Student, Balasore, Odisha, India

07 Aug 2026

The Sun's Frozen Crown  

 A luminous ring encircles the sun above Tulancingo, Hidalgo, Mexico—a celestial crown suspended in the midday sky. The 22° solar halo forms when sunlight passes through hexagonal ice crystals in high-altitude cirrostratus clouds.     

—Dante Iván Delgadillo-Licona, Universidad Tecnológica de Tulancingo, Tulancingo, Mexico

31 Jul 2026

Crystal Landscape

Crystal structures formed from a mixture of beta-alanine and Coca Cola create a colorful, abstract landscape when viewed under a microscope using polarized light.    

—Janeklass, Estonia Wiki Science Competition 2025; CC-BY-4.0

24 Jul 2026

Supercontinuum in Air 

Supercontinuum light (in red) coming off of a plasma generated by focusing an ultrafast IR laser. The image was captured at the University of Rochester's Laboratory for Laser Energetics using 400 ISO film with a 1 second exposure.  

— Hunter S. Markland, University of Rochester, NY, USA

17 Jul 2026

Microgravity Physics 

Tiny ball bearings surround a larger central bearing during a fluid particles experiment, conducted inside the Microgravity Science Glovebox (MSG) aboard the International Space Station’s Destiny laboratory module on 20 October 2025.    

—NASA / Zena Cardman

10 Jul 2026

Rainbow in a Bubble 

Light hitting a soap film creates magical rainbow stripes—nature’s artwork in the tiniest place. When illuminated by a flashlight, the soap film’s varying thickness creates vivid, multi-colored interference fringes ranging from violet and green to yellow and white. These colors arise from constructive and destructive interference of reflected light waves at the air–film boundaries.    

—Achini Mala Sri Ovitigala, Mississippi State University, Starkville, MI, USA

03 Jul 2026

Crossed Diffraction 

A simple white light source transforms into a radiant burst of color through the interaction of crossed diffraction gratings. The overlapping gratings split and replicate the light into repeated spectral bands, producing a circular arrangement of vivid chromatic patterns that resemble a luminous optical mandala.   

— Ana Karen Reyes, Universidad Tecnológica de Tulancingo, Mexico

26 Jun 2026

Staying Visible

Colorful chemoluminescent light sticks illuminate bikes during a bike visibility social ride in Ottawa, Canada.[OPN 2025 Photo Contest]    

—Yaryna Mamchur, University of Ottawa, Ottawa, Canada

19 Jun 2026

Shiny, Tiny Eyes  

Macro photography reveals complex textures and patterns within the iris, which can look similar to a “galaxy” or an alien landscape. 

—Sai Krishna, civil engineer, Hyderabad, India

12 Jun 2026