A grain of sand holds thousands of galaxies

Space · Published 26 October 2026 Swipe more like this →

In short: Imagine holding a single grain of sand at arm's length. That tiny speck contains an entire universe of light that has traveled for over 13 billion years to reach your eyes. This is the reality of our deepest look into the cosmos.

The James Webb Space Telescope (JWST) recently unveiled 'Webb’s First Deep Field,' a high-resolution infrared image of the galaxy cluster SMACS 0723. While previous tools like the Hubble Space Telescope provided revolutionary views—such as capturing a head-on collision between two galaxies in Arp 143 that created a triangular firestorm of thousands of stars—Webb represents a generational leap in resolution and depth.

The mechanism behind this clarity lies in Webb's ability to see infrared light. Because the universe is expanding, light from the earliest galaxies has been stretched into infrared wavelengths. Webb’s Near-Infrared Camera (NIRCam) captured these faint structures, revealing star clusters and diffuse features that were previously invisible. The image was produced as a composite of different wavelengths over 12.5 hours, achieving depths in less time than Hubble's deepest fields, which required weeks of exposure.

A key feature of this specific field is gravitational lensing. The combined mass of the SMACS 0723 cluster acts as a natural magnifying glass, bending and intensifying the light from even more distant objects behind it. By using this effect, scientists can observe galaxies dating back to before the cosmos reached one billion years of age. By analyzing these spectra, researchers can now identify the chemical makeup of galaxies in the very early universe, offering a window into the origins of our cosmos.

This technology functions as a literal time machine. Because light travels at 186,000 miles per second, the photons captured in this image have been in transit for billions of years. Future observations aim to push even further back, potentially reaching 13.5 billion years ago—nearly to the beginning of everything.

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