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47 million galaxies: A sunning new view of our universe
Monday, April 20, 2026 by Russ Scritchfield
An international team has unveiled a sweeping three dimensional map of the cosmos that brings the distribution of galaxies into sharp relief across much of observable space. Built from the Dark Energy Spectroscopic Instrument, the map charts where galaxies are located and how their positions change ...
Seeing color clearly with color science tools
Thursday, March 26, 2026 by Russ Scritchfield
Spend enough hours staring at a screen trying to tame a stacked image and you learn that color is not a flavor choice. It is a measurement problem, full of assumptions about spectra, sensors, displays, and our own eyes. We publish images on the web, and the web speaks sRGB by default. That means eve...
Why luminance frames miss narrowband nebula details
Monday, October 13, 2025 by Richard Harris
So you've spend a clear night capturing the Orion Nebula with your monochrome astrophotography camera. You shot one image through a luminance filter (essentially capturing all visible light), and another through a special Hydrogen-alpha (Hα) narrowband filter. When...
Core of Andromeda galaxy by Weitang Liang, Qi Yang, Chuhong Yu
Saturday, September 20, 2025 by Austin Harris
The 2025 ZWO Astronomy Photographer of the Year competition, organized by the Royal Observatory Greenwich, showcased a wide range of astrophotography from around the world. The competition received over 5,500 entries from 69 countries, including submissions from both amateur and professional photogr...